WO2014187260A1

WO2014187260A1 - Method, device for sending/receiving public message and system

Info

Publication number: WO2014187260A1
Application number: PCT/CN2014/077495
Authority: WO
Inventors: 石靖; 戴博; 方惠英; 夏树强; 李新彩; 刘锟
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-09-27
Filing date: 2014-05-14
Publication date: 2014-11-27
Also published as: CN104518843A; CN104518843B

Abstract

Disclosed are a method and device for sending a public message, a method and device for receiving a public message, and a system for transmitting a public message. The method for sending a public message comprises: a base station determining a time-frequency resource position for sending a public message according to a coverage level; and sending the public message via the time-frequency resource position, wherein the public message is borne on a service channel. By means of the present invention, the problem due to the fact that there is not a method for transmitting a public message in a coverage enhancement scenario in the related art is solved, thereby providing a method for transmitting the public message in the coverage enhancement scenario.

Description

The present invention relates to the field of communications, and in particular to a public message transmitting method and apparatus, a public message receiving method, a device, and a public message transmitting system. BACKGROUND OF THE INVENTION Machine Type Communication (referred to as MTC) User Equipment (User Equipment, also referred to as UE, also referred to as user terminal), also known as Machine to Machine (M2M) user communication equipment, It is currently the main application form of the Internet of Things. In recent years, due to the high spectrum efficiency of Long-Term Evolution (LTE)/Long-Term Evolution Advance (LTE-Advance or LTE-A), more and more mobile operations The LTE/LTE-A is selected as the evolution direction of the broadband wireless communication system. MTC multi-class data services based on LTE/LTE-A will also be more attractive. The existing LTE/LTE-A system is based on dynamic scheduling of each subframe, that is, each subframe can transmit different control channels, and its frame structure is as shown in FIG. 1 and FIG. 2. 1 is a schematic diagram of a frame structure of a Frequency Division Duplexing (FDD) mode according to the related art. As shown in FIG. 1, a 10 ms radio frame is composed of twenty lengths of 0.5 ms, number 0~ The slot of 19 is composed, and the slots 2i and 2i+1 form a subframe of length lms i, i is 0 or a natural number. 2 is a schematic diagram of a frame structure of a Time Division Duplexing (TDD) mode according to the related art. As shown in FIG. 2, a 10 ms radio frame consists of two half frames of 5 ms length. Composition, one field includes five subframes of length lms, and subframe i is defined as two slots 2i and 2i+1 that are 0.5 ms long.

A physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) is defined in LTE/LTE-A. The information carried by the Physical Control Format Indicator Channel (PCFICH) is used to indicate the Orthogonal Frequency Division Multiplexing (OFDM) symbol of the PDCCH transmitted in one subframe. number. Physical Hybrid-ARQ Indicator Channel (PHICH for short) is used for Acknowledgment/negative acknowledgement (ACK/NACK) feedback information carrying uplink transmission data, where ARQ is an abbreviation of Automatic Repeat-reQuest.

The PDCCH is used to carry downlink control information (Downlink Control Information, DCI for short), and includes: uplink and downlink scheduling information, and uplink power control information. Generally, the MTC terminal can obtain the DCI by demodulating the PDCCH channel in each subframe, so as to implement a solution to the Physical Downlink Share Channel (PDSCH) and the Physical Uplink Share Channel (PUSCH). Tune.

The message carried on the PDSCH is divided into a public message and a user-specific message. For a public message, a plurality of UEs in a cell can be simultaneously received, and a user-specific message can only be received by one UE in a cell. And whether the PDSCH carries a public message or a user-specific message, the PDCCH is required to perform a scheduling indication, that is, the terminal must receive the PDCCH correctly before receiving the PDSCH. The inventors of the present invention found in the course of research that, in practical applications, there is a class of terminals whose coverage performance is significantly degraded due to the limited location or self-characteristics. For example, smart meter reading MTC terminals are mostly installed in a low coverage performance environment such as a basement. They mainly send packet data, have low data rate requirements, and can tolerate large data transmission delays. Since such a terminal has low data rate requirements, for the data channel, the correct transmission of the packet data can be ensured by a lower modulation and coding rate and multiple repetitions in the time domain, and the synchronization channel itself transmits The same information, the terminal can receive the same information sent by multiple subframes. Therefore, in a scenario where coverage is limited, both the traffic channel and the control channel need to be repeatedly transmitted to improve coverage. For the repeated transmission of the traffic channel carrying the public message, the control channel in the public search space needs to be repeated to schedule the indication. However, the public search space is small at present, and the blocking rate is greatly increased for a large number of repeated transmissions, thereby making the system inoperable. Therefore, it is necessary to provide a method of how to transmit public messages in an overlay enhanced scenario. There is no effective solution for the problem caused by the method of transmitting a public message in a coverage-enhanced scenario in the related art. SUMMARY OF THE INVENTION Embodiments of the present invention provide a public message sending method, a device, a public message receiving method, a device, and a public message transmission system, to at least solve a method for transmitting a public message in a coverage enhanced scenario in the related art. The problem caused. According to an aspect of the present invention, a public message sending method is provided, including: determining, by a base station, a time-frequency resource location for transmitting a public message according to a coverage level; and transmitting, by using the time-frequency resource location, the public message, where The public message is carried on a traffic channel. Preferably, the traffic channel is repeatedly transmitted at the time-frequency resource location, where the number of repeated transmissions of the traffic channel is determined by at least one of the following: the number of repeated transmissions of the traffic channel carrying the public message Different from the number of repeated transmissions of the traffic channel scheduled by the control channel scrambled by the Cell Radio Network Temporary Identity (C-RNTI); the number of repeated transmissions of the traffic channel carrying the public message is the same; Determining the number of repeated transmissions of the corresponding service channel, where the public message includes at least one of the following: a system information block (sm) message, a random access response

(RAR) message, paging (Paging) message. Preferably, determining, according to the type of the public message to be carried, the number of repeated transmissions of the corresponding service channel includes at least one of: a number of repeated transmissions according to a broadcast channel, a maximum coverage level of the base station, and the sm message. Determining the number of repeated transmissions of the traffic channel carrying the sm message according to at least one of a periodic configuration or a first predefined value; according to a preamble sent by the user equipment in the random access, the maximum of the base station Determining, according to at least one of a coverage level, a coverage level of the user equipment, or a second predefined value, a number of repeated transmissions of the traffic channel carrying the RAR message; according to the user equipment being in random access Determining, by the transmitted preamble, the maximum coverage level of the base station, the coverage level of the user equipment, the radio resource control layer (RRC) signaling, or the third predefined value, determining the bearer message The number of repeated transmissions of the traffic channel. Preferably, determining, according to the preamble sent by the user equipment in the random access, the number of repeated transmissions of the traffic channel carrying the RAR message or the Paging message comprises: according to the preamble time-frequency resource or The sequence of preambles determines a number of repeated transmissions of the traffic channel carrying the RAR message or the Paging message. Preferably, the traffic channel carrying the sm message is intermittently repeatedly transmitted according to a preset period, where the preset period is a period of a fixed duration or a period of a group of durations configured according to a fourth predefined value. Preferably, the traffic channel carrying the sm message is repeatedly transmitted in the preset period, and the one-time repeated transmission is located in one or more sm periods. Preferably, the traffic channel carrying the sm message is sent in a non-periodic manner. Preferably, the traffic channel carrying the public message, in the case of no control channel scheduling indication, determining a frequency domain resource for repeatedly transmitting the traffic channel by using at least one of: in a frequency domain aggregation level Determining a number of PRBs in a physical resource block (PRB) resource occupied by the frequency domain resource, where binary phase shift keying (BPSK) modulation or quadrature phase shift keying (QPSK) is adopted on the frequency domain resource Modulating, and scrambling a cyclic redundancy check (CRC) bit corresponding to the public message by using a first radio network temporary identifier (RNTI), a second RNTI, and a third RNTI, where the first RNTI includes a value Different SI-RNTIs and M-SI-RNTIs are used for scrambling CRC bits corresponding to the SIB messages; the second RNTIs include P-RNTIs and MP-RNTIs with different values for the Paging message. Corresponding CRC bit scrambling; the third RNTI includes RA-RNTI and M-RA-RNTI with different values for scrambling of CRC bits corresponding to the RAR message; determining according to an indication of RRC signaling The PRB resource occupied by the frequency domain resource; Five predefined values, determining the frequency-domain resources of the PRB resources occupied. Preferably, the starting position of the PRB resource is determined by one of the following methods: determining that the PRB resource with the smallest number among the PRB resources is the starting location; determining that the PRB resource with the largest number among the PRB resources is the Determining a starting position; determining the starting position of the PRB resource according to a formula ^^ + ¹¹ ^^^ ""^'; wherein L represents an aggregation level; ^Y k = ! Or = ^A · ^k · ^SFN · " n dD; _{m =} i, ₂ , .. _{M M} ^(L) . M (L) represents the number of candidate sets corresponding to the aggregation level L; ^ represents the subframe with the subframe number k The total number of PRBs occupied by the traffic channel carrying the public message when there is no control transmission; D is the constant 65537; A is the constant 39827; k is the subframe number; i=0, ..., L-1 is an aggregation level The search unit; nRNTI indicates the value of the RNTI that scrambles the CRC bits, SFN indicates the radio frame number, and mod indicates the modulo operation. Preferably, in the case that the RPB resource occupied by the frequency domain resource is determined according to an indication of RRC signaling or according to a fifth predefined value, the PRB resource is a continuous or discrete PRB resource, and the RPB The number of PRBs of resources is less than or equal to 6. Preferably, determining that the traffic channel carrying the public message is in a subframe within a subframe in which the traffic channel is transmitted is a third orthogonal frequency division multiplexing (OFDM) symbol, or, according to a bandwidth of the system, Determining a start symbol of the traffic channel carrying the public message within the subframe. Preferably, determining, according to a bandwidth of the system, a manner in which the start symbol of the traffic channel carrying the public message in the subframe includes one of: in a case where the system bandwidth is 1.4 MHz, Determining that the fifth OFDM symbol of the subframe is the start symbol; and if the system bandwidth is greater than 1.4 MHz, determining that the fourth OFDM symbol of the subframe is the start symbol. Preferably, the time-frequency resource location occupied by the traffic channel carrying the sm message in the case of a larger coverage level includes a time-frequency resource location occupied by a smaller coverage level. Preferably, the starting position of the subframe used for transmitting the traffic channel is determined by one of the following manners: determining, according to a type of the public message of the bearer, a start of the subframe by using a sixth predefined value a location; determining, according to the κ value, a starting location of the subframe for transmitting the traffic channel carrying the sm message, where the K value satisfies a relationship (K + h*n) mod M=i, Where K represents the number of available downlink subframes in the radio frame in the starting position, 0 K hl, n represents the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, M represents the period of intermittent repeated transmission, 0^i^hl, where, in the time division duplex (TDD) system, the downlink subframes in the radio frame are renumbered sequentially; the transmission is determined according to the L value. And a start position of the subframe of the traffic channel carrying the RAR message or the Paging message, where the L value satisfies a relationship (L + h*n) mod N=j. Where L represents the number of available downlink subframes in the radio frame in the starting position, 0 L hl, n represents the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, where N is the number of repeated transmissions, 0 j hl, where the downlink subframes are renumbered according to the available downlink subframes in the radio frame; and the traffic channel for transmitting the Paging message is determined according to the H value. The starting position of the subframe, wherein the H value satisfies the relationship (H + h*n) mod T=j. Where H is the number of available downlink subframes in the radio frame in the starting position, 0 H hl, n is the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, T represents the period of repeated transmission, 0 j ^hl , where, in the TDD system, the downlink subframes in the radio frame are re-ordered sequentially; Determining for the transmission bearer according to one of a subframe in which the sequence of the preamble in the random access is located, a type of the sequence, a coverage level of the base station corresponding to the preamble, or a seventh predefined value The starting position of the subframe of the traffic channel of the RAR message. Preferably, determining, according to the type of the public message that is carried, the location of the subframe includes at least the following

Determining that a subframe for transmitting the traffic channel carrying the RAR message is sent in a continuous manner; determining that a subframe for transmitting the traffic channel carrying the Paging message is sent by using a discrete selection manner; The subframe in which the traffic channel carrying the sm message is transmitted is transmitted in a cyclically repeated manner. Preferably, in a case where it is determined that the subframe for transmitting the traffic channel carrying the sm message is transmitted in a cyclically repeated manner, the control channel scheduling the traffic channel is transmitted in the same periodic repetition manner. Preferably, in the case that the traffic channel carrying the public message is periodically transmitted repeatedly, the frequency domain resources of the traffic channel carrying the public message on multiple subframes for repeatedly transmitting the traffic channel are the same. . Preferably, in a case where the traffic channel carrying the public message has a control channel scheduling indication, on a plurality of subframes for repeatedly transmitting the traffic channel, the traffic channel carrying the public message corresponds to The control channel occupies the same amount of resources. Preferably, the number of repeated transmissions of the control channel is determined according to a maximum coverage level of the base station or a type of the public message carried by the corresponding traffic channel. Preferably, if the traffic channel carrying the public message has a control channel scheduling indication, the control channel corresponding to the traffic channel carrying the SIB message uses the M-SI-RNTI or the SI-RNTI to scramble the CRC bit. The value of the M-SI-RNTI is different from the value of the SI-RNTI. Preferably, the physical downlink control channel scrambled by using the M-SI-RNTI and the physical downlink traffic channel scheduled by the physical downlink control channel are transmitted in the same subframe or different subframes. According to another aspect of the present invention, a method for receiving a public message is provided, including: receiving, by a user equipment, a public message at a specific time-frequency resource location according to a coverage level, where the specific time-frequency resource location is a network Determined by the side, the public message is carried on a traffic channel. Preferably, the traffic channel is repeatedly received at the specific time-frequency resource location, where the number of repetitions of the traffic channel is determined by at least one of the following: the number of repetitions of the traffic channel carrying the public message Different from the number of repetitions of the traffic channel scheduled by the control channel scrambled by the Cell Radio Network Temporary Identity (C-RNTI); the number of repetitions of the traffic channel carrying the public message is the same; according to the public message of the bearer Type, determining the number of repetitions of the corresponding traffic channel. The public message includes at least one of the following: a system information block (sm) message, a random access response

(RAR) message, paging (Paging) message. Preferably, determining, according to the type of the public message to be carried, the number of repetitions of the corresponding service channel includes at least one of: a repetition period of a broadcast channel, a maximum coverage level, a periodic configuration of the sm message, or a first Determining the number of repetitions of the traffic channel carrying the sm message according to at least one of the predefined values; according to the preamble sent by the user equipment in the random access, the maximum coverage level of the base station, Determining the number of repetitions of the traffic channel carrying the RAR message according to at least one of a coverage level of the user equipment or a second predefined value; according to the preamble sent by the user equipment in the random access, Determining a repetition of the traffic channel carrying the Paging message by at least one of a maximum coverage level of the base station, a coverage level of the user equipment, a Radio Resource Control Layer (RRC) signaling, or a third predefined value frequency. Preferably, determining, according to the preamble sent by the user equipment in the random access, the number of repetitions of the traffic channel carrying the RAR message or the Paging message comprises: according to the time-frequency resource or the preamble of the preamble The preamble sequence determines the number of repetitions of the traffic channel carrying the RAR message or the Paging message. Preferably, the traffic channel carrying the sm message is intermittently repeatedly received according to a preset period, where the preset period is a period of a fixed duration or a period of a group of durations configured according to a fourth predefined value. Preferably, the traffic channel carrying the sm message is repeatedly received in the preset period, and the one-time repeated reception is located in one or more sm periods. Preferably, in the case that the traffic channel carrying the sm message is aperiodicly repeated, receiving the public message at the specific time-frequency resource location comprises: determining, by using blind detection, the device carrying the sm message Said traffic channel. Preferably, the method further includes: the user equipment performing a plurality of sm period attempts to decode the traffic channel carrying the sm message. Preferably, the traffic channel carrying the public message, in the case of no control channel scheduling indication, determines a frequency domain resource for repeatedly receiving the traffic channel by using at least one of: in a frequency domain aggregation level And blindly detecting the number of PRBs in the physical resource block (PRB) resource occupied by the frequency domain resource, where binary phase shift keying (BPSK) demodulation or quadrature phase shift keying is used on the frequency domain resource ( Demodulating, and descrambling a cyclic redundancy check (CRC) bit corresponding to the public message by using a first radio network temporary identifier (RNTI), a second RNTI, and a third RNTI, where the first RNTI The SI-RNTI and the M-SI-RNTI with different values are used for descrambling the CRC bits corresponding to the SIB message. The second RNTI includes P-RNTIs and MP-RNTIs with different values. The descrambling of the CRC bit corresponding to the Paging message; the third RNTI includes RA-RNTI and M-RA-RNTI with different values for descrambling of CRC bits corresponding to the RAR message; Instructing to determine the PRB resource occupied by the frequency domain resource; Five predefined values, determining the frequency-domain resources of the PRB resources occupied. Preferably, the starting position of the PRB resource is determined by one of the following methods: determining that the PRB resource with the smallest number among the PRB resources is the starting location; determining that the PRB resource with the largest number among the PRB resources is the Said starting position; determined according to the formula ^^ ^^^^ ^^! ^! ^ The starting position of the resource, where L is the aggregation level; = 0 ⁴ '" 77 ) ¹¹¹ . ⁽ ^ or ₌ ( ^ ^^ . _3⁄4 ^ ) 111. (11); _{m =} i, 2,.. „ M ^L) . M (L) denotes the number of candidate sets corresponding to the aggregation level L; ^ denotes the total number of PRBs occupied by the traffic channel carrying the public message for the uncontrolled transmission on the subframe with the subframe number k; D denotes a constant 65537; A represents a constant 39827; k represents a subframe number; i=0, ..., L-1 represents a search unit corresponding to an aggregation level; nRNTI represents a RNTI value of a scrambled CRC bit, and SFN represents a radio frame number, Mod represents the modulo operation. Preferably, in the case that the RPB resource occupied by the frequency domain resource is determined according to an indication of RRC signaling or according to a fifth predefined value, the PRB resource is a continuous or discrete PRB resource, and the RPB The number of PRBs of resources is less than or equal to 6. Preferably, determining that the traffic channel carrying the public message is in a subframe within a subframe in which the traffic channel is transmitted is a third orthogonal frequency division multiplexing (OFDM) symbol, or, according to a bandwidth of the system, Determining a start symbol of the traffic channel carrying the public message within the subframe. Preferably, determining, according to a bandwidth of the system, a manner in which the start symbol of the traffic channel carrying the public message in the subframe includes one of: in a case where the system bandwidth is 1.4 MHz, Determining that the fifth OFDM symbol of the subframe is the start symbol; and if the system bandwidth is greater than 1.4 MHz, determining that the fourth OFDM symbol of the subframe is the start symbol. Preferably, the specific time-frequency resource location occupied by the traffic channel carrying the sm message in the case of a larger coverage level includes a specific time-frequency resource location occupied by a smaller coverage level. Preferably, the starting position of the subframe for receiving the traffic channel is determined by one of the following manners: determining, according to a type of the public message of the bearer, a start of the subframe by using a sixth predefined value position. Determining, according to the κ value, a starting position of the subframe for transmitting the traffic channel carrying the sm message, where the K value satisfies a relationship (K + h*n) mod M=i, where K Indicates the number of available downlink subframes in the radio frame in the starting position, 0 K hl, n indicates the radio frame in the subframe where the starting position is located, and h is the available downlink subframe included in one radio frame. The number of times, M indicates the period of intermittent repeated transmission, 0^i^hl, where, in the time division duplex (TDD) system, the downlink subframes in the radio frame are re-sequenced sequentially; the transmission carrier is determined according to the L value. Determining a starting position of the subframe of the traffic channel of the RAR message or the paging message, wherein the L value satisfies a relationship (L + h*n) mod N=j. Where L represents the number of available downlink subframes in the radio frame in the starting position, 0 L hl, n represents the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, where N is the number of repeated transmissions, 0 j hl, where the downlink subframes are renumbered according to the available downlink subframes in the radio frame; and the traffic channel for transmitting the Paging message is determined according to the H value. The starting position of the subframe, wherein the H value satisfies the relationship (H + h*n) mod T=j. Where H represents the number of available downlink subframes in the radio frame in the starting position, 0 H hl, n represents the subframe where the starting position is located The radio frame, h is the number of available downlink subframes included in one radio frame, and T is the period of repeated transmission, 0 j ^hl , where, in the TDD system, the downlink subframes in the radio frame are re-sequenced sequentially; Determining, for receiving the bearer, the one of the subframe in which the preamble sequence in the access is located, the type of the sequence, the coverage level of the base station corresponding to the preamble, or the seventh predefined value The starting position of the subframe of the traffic channel of the RAR message. Preferably, determining, according to the type of the public message that is carried, the location of the subframe includes at least the following

Determining that a subframe for transmitting the traffic channel carrying the RAR message is received in a continuous manner; determining that a subframe for transmitting the traffic channel carrying the Paging message is received in a discrete selection manner; The subframe in which the traffic channel carrying the sm message is transmitted is received in a cyclically repeating manner. Preferably, in the case that it is determined that the subframe for transmitting the traffic channel carrying the sm message is received in a cyclically repeated manner, the control channel scheduling the traffic channel is received in the same periodic repetition manner. Preferably, in a case that the traffic channel carrying the public message adopts periodic repeated reception, the frequency domain resources of the traffic channel carrying the public message on multiple subframes for repeatedly receiving the traffic channel are the same . Preferably, in a case where the traffic channel carrying the public message has a control channel scheduling indication, on a plurality of subframes for repeatedly receiving the traffic channel, the traffic channel carrying the public message corresponds to The control channel occupies the same amount of resources. Preferably, the number of repeated receptions of the control channel is determined according to a maximum coverage level or a type of the public message carried by the corresponding traffic channel. Preferably, if the traffic channel carrying the public message has a control channel scheduling indication, the control channel corresponding to the traffic channel carrying the SIB message uses the M-SI-RNTI or the SI-RNTI to scramble the CRC bit. The value of the M-SI-RNTI is different from the value of the SI-RNTI. Preferably, the physical downlink control channel scrambled by using the M-SI-RNTI and the physical downlink traffic channel scheduled by the physical downlink control channel are received in the same subframe or different subframes. According to another aspect of the present invention, a public message sending apparatus is further disposed on the network side, where the apparatus includes: a first determining module, configured to determine, according to a coverage level, a time-frequency resource location for transmitting a public message; And sending, by the time-frequency resource location, the public message, where the public message is carried on a traffic channel. According to another aspect of the present invention, a public message receiving apparatus is further provided on a terminal side, where the apparatus includes: a receiving module, configured to receive a public message at a specific time-frequency resource location according to a coverage level, where The specific time-frequency resource location is determined by the network side, and the public message is carried on the traffic channel. According to another aspect of the embodiments of the present invention, there is also provided a public message transmission system comprising the above-described public message transmitting apparatus and the above-described public message receiving apparatus. According to the embodiment of the present invention, the base station determines the location of the time-frequency resource for transmitting the public message according to the coverage level; and sends the public message by using the time-frequency resource location, where the public message is carried on the service channel, and the related art is solved. There is no problem caused by a method of transmitting a public message in an overlay enhanced scenario, thereby providing a method of transmitting a public message in an overlay enhanced scenario. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a frame structure of an FDD mode according to the related art; FIG. 2 is a schematic diagram of a frame structure of a TDD mode according to the related art; FIG. 3 is a flowchart of a public message transmitting method according to an embodiment of the present invention; 4 is a schematic structural diagram of a public message transmitting apparatus according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a public message transmitting system according to an embodiment of the present invention; and FIGS. 6a to 6c are diagrams showing a preferred embodiment of the present invention. FIG. 7 is a schematic diagram of a flow of a public message transmission method according to a preferred embodiment of the present invention; FIG. 7 is a schematic diagram of a flow of a primary message, a secondary level, and a third level; FIG. 8 is a second schematic diagram of a flow of a public message transmission method according to a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. The steps illustrated in the flowchart of the figures may be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, may differ from this The steps shown are performed in the order shown or described. The present embodiment provides a public message sending method. FIG. 3 is a schematic flowchart of a public message sending method according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps: Step S302: A base station determines according to a coverage level. Sending a time-frequency resource location of the public message; Step S304, transmitting a public message by using the time-frequency resource location, where the public message is carried on the traffic channel. Through the foregoing steps, the base station determines, according to the coverage level, the location of the time-frequency resource that sends the public message and sends the public message at the determined time-frequency resource location, thereby providing a method for transmitting the public message in the coverage-enhanced scenario, thereby being able to solve the problem. When the public search space is limited, the problem of increasing the blocking rate caused by a large number of repeated transmissions ensures the normal and stable operation of the system. Preferably, the foregoing coverage level may be confirmed according to at least one of the following: pre-configuration, a preamble resource or sequence sent by the user equipment in the random access process, a measurement signal sent by the base station or the user equipment, and a radio resource control layer (Radio Resource) Control layer, referred to as RRC) signaling. Preferably, the traffic channel is repeatedly transmitted at the time-frequency resource location. In the case of performing repeated transmission, the number of repeated transmissions of the traffic channel may be determined in multiple manners, for example, by using at least one of the following methods:

1. The number of repeated transmissions of the traffic channel carrying the public message is different from the number of repeated transmissions of the traffic channel scheduled by the control channel scrambled by the Cell Radio Network Temporary Identifier (C-RNTI). Setting

2. The number of repeated transmissions of the service channel carrying the public message can be set to the same number of repeated transmissions; 3. According to the type of the public message that is carried, for example, a system information block (SIB) message, a random access response (RAR) message, or a paging (Paging) message, determine the corresponding The number of repeated transmissions of the traffic channel. Preferably, the public message may be at least one of the following types of messages: SIB message, RAR message, Paging message. Preferably, in the foregoing manner, determining the number of repeated transmissions of the corresponding service channel according to the type of the public message to be carried may be in multiple manners, for example: adopting at least one of the following methods:

For the sm message, the service channel carrying the sm message may be determined according to at least one of the number of repeated transmissions of the broadcast channel, the maximum coverage level of the base station, the periodic configuration of the sm message, or the first predefined value. Repeated number of transmissions;

2. For the RAR message, the bearer RAR message may be determined according to at least one of a preamble sent by the user equipment in the random access, a maximum coverage level of the base station, a coverage level of the user equipment, or a second predefined value. The number of repeated transmissions of the traffic channel;

For the RAR message, according to at least one of a preamble sent by the user equipment in the random access, a maximum coverage level of the base station, a coverage level of the user equipment, RRC signaling, or a third predefined value, Determine the number of repeated transmissions of the traffic channel carrying the Paging message. Preferably, in the foregoing manner, determining, according to the preamble sent by the user equipment in the random access, the number of repeated transmissions of the traffic channel carrying the RAR message or the Paging message includes: determining the bearer RAR according to the preamble time-frequency resource or the preamble sequence The number of repeated transmissions of the traffic channel of the message or Paging message. Preferably, the traffic channel carrying the sm message may be intermittently and repeatedly transmitted according to a preset period, where the preset period may be a period of a fixed duration or a period of a group of duration configured according to a fourth predefined value, for example, a period fixed setting Set to a different value for a fixed value or in different scenarios. Preferably, the traffic channel carrying the sm message is repeatedly transmitted in a preset period, and the one-time repeated transmission is located in one or more sm periods. Preferably, the traffic channel carrying the sm message is sent in a non-periodic manner, wherein the user equipment can determine the traffic channel carrying the sm message by blind detection. Preferably, in order to reduce the number of transmissions of the traffic channel, the user equipment may perform multiple periodic attempts to decode the traffic channel carrying the sm message. Preferably, the multiple cycles may include one of the following: 4, 8, 16 32, 64. Preferably, the traffic channel carrying the public message can determine the frequency domain resource for repeatedly transmitting the traffic channel in multiple manners without the control channel scheduling indication, for example, by using at least one of the following methods:

1. In each frequency domain aggregation level, determine the number of PRBs in the physical resource block (PRB) resource occupied by the frequency domain resource, where binary phase shift keying is used on the frequency domain resource (Binary) Phase Shift Keying (referred to as BPSK) modulation or Quadrature Phase Shift Keying (QPSK) modulation, and respectively pass the first Radio Network Temporary Identifier (RNTI), the second The RNTI and the third RNTI scramble a Cyclic Redundancy Check (CRC) bit corresponding to the public message; wherein, the first RNTI includes SI-RNTIs (SIB-RNTI) and P M-SI with different values - RNTI (MTC-SIB-RNTI), used for scrambling of CRC bits corresponding to SIB messages; second RNTI includes P-RNTKPaging-RNTI with different values and MP-RNTI (MTC-Paging-RNTI), for The CRC bit corresponding to the Paging message is scrambled; the third RNTI includes RA-RNTI (RAR-RNTI) and M-RA-RNTI (MTC-RAR-RNTI) with different values, and is used for adding CRC bits corresponding to the RAR message. Disturb.

2. Determine, according to the indication of the RRC signaling, the PRB resource occupied by the frequency domain resource;

3. Determine the PRB resource occupied by the frequency domain resource according to the fifth predefined value. Preferably, the starting position of the PRB resource in the above manner may further include, but is not limited to, one of the following ways:

1. Determine the PRB resource with the lowest number in the PRB resource as the starting position;

2. Determine the PRB resource with the highest number in the PRB resource as the starting position;

3. Determine the starting position of the PRB resource according to the formula ^^ + ¹¹ ^^^ ""^'; where L is the aggregation level; = ( " ^ = (H _M ( ) ; M ( ^L ) indicates the aggregation level L corresponds The number of candidate sets; ^ represents the total number of PRBs occupied by the traffic channel carrying the public message for the uncontrolled transmission on the subframe with the subframe number k; D represents the constant 65537; A represents the constant 39827; k represents the subframe number; =0 ... L-1 represents a search unit corresponding to an aggregation level; _3⁄41 ^ represents the value of the RNTI scrambling the CRC bits, SFN represents the radio frame number, and mod represents the modulo operation. Preferably, L = l 2 3 6 ; ^N ^ ^k =6 o Preferably, in the case that the RPB resource occupied by the frequency domain resource is determined according to the indication of the RRC signaling or according to the fifth predefined value, the PRB resource is a continuous or discrete PRB resource, and the number of PRBs of the RPB resource is less than or equal to 6. . Preferably, the starting position of the traffic channel carrying the public message in the subframe of the transport service channel is determined to be the third OFDM symbol, or the start of the traffic channel carrying the public message in the subframe is determined according to the bandwidth of the system. symbol. Preferably, in the case that the start symbol of the traffic channel carrying the public message in the subframe is determined according to the bandwidth of the system, including but not limited to adopting one of the following methods:

1. When the system bandwidth is 1.4 MHz, determine that the fifth OFDM symbol of the subframe is the start symbol; 2. In the case that the system bandwidth is greater than 1.4 MHz, determine the fourth OFDM symbol of the subframe as the start. symbol. Preferably, the time-frequency resource location occupied by the traffic channel carrying the sm message in the case of a larger coverage level includes the time-frequency resource location occupied by the smaller coverage level, that is, as the coverage level increases, before The occupied time-frequency resource location does not change, but a new time-frequency resource location is newly added. Preferably, the manner of determining the starting position of the subframe used for transmitting the traffic channel includes, but is not limited to, the following manner:

Determining, according to the type of the public message that is carried, the starting position of the subframe, for example, using the sixth predefined value, the traffic channels carrying different types of public messages are corresponding to different subframe starting positions;

2. Determine a starting position of a subframe for transmitting a traffic channel carrying the sm message according to the κ value, where the κ value satisfies the relation (K + h*n) mod M=i, where K represents the starting position The number of available downlink subframes in the subframe in the radio frame, 0 K hl, n indicates the radio frame in which the subframe at the start position is located, h is the number of available downlink subframes included in one radio frame, and M indicates the interval. The period of repeated transmission, 0^i^hl, wherein, in the TDD system, the downlink subframes in the radio frame are re-sequenced sequentially;

3. Determine a starting position of a subframe for transmitting a traffic channel carrying a RAR message or a Paging message according to the L value, where the L value satisfies the relation (L + h*n) mod N=j. Where L represents the number of available downlink subframes in the radio frame in the starting position, 0 L hl, n represents the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, where N is the number of repeated transmissions, 0 j hl, where the downlink subframes in the radio frame are renumbered sequentially in the TDD system; 4. Determine a starting position of a subframe for transmitting a traffic channel carrying the Paging message according to the H value, where the H value satisfies the relation (H + h*n) mod T=j. Where H is the number of available downlink subframes in the radio frame in the starting position, 0 H hl, n is the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, T represents the period of repeated transmission, 0 j hl, where, in the TDD system, the downlink subframes in the radio frame are re-ordered sequentially;

Determining, according to one of a subframe in which the sequence of the preamble in the random access is located, a type of the sequence, a coverage level of the base station corresponding to the preamble, or a seventh predefined value, determining to transmit the bearer RAR message The starting position of the subframe of the traffic channel. Preferably, determining the location of the subframe according to the type of the public message carried includes, but is not limited to, at least one of the following:

1. Determine that the subframe used for transmitting the traffic channel carrying the RAR message is sent in a continuous manner;

2. Determining, by using a discrete selection, a subframe for transmitting a traffic channel carrying the Paging message;

3. Determine that the subframe used for transmitting the traffic channel carrying the sm message is sent in a cyclically repeated manner. Preferably, in the case that the subframe for determining the traffic channel for transmitting the bearer sm message is transmitted in a cyclically repeated manner, the control channel scheduling the traffic channel is transmitted in the same periodic repetition manner. Preferably, in a case where the traffic channel carrying the public message is periodically transmitted repeatedly, the frequency domain resources of the traffic channel carrying the public message in the multiple subframes for repeatedly transmitting the traffic channel are the same. Preferably, in the case that the traffic channel carrying the public message has a control channel indication, on a plurality of subframes for repeatedly transmitting the traffic channel, the control channel corresponding to the traffic channel carrying the public message occupies the same resource size. Preferably, the number of repeated transmissions of the control channel may also be determined according to the maximum coverage level of the base station or the type of the public message carried by the corresponding traffic channel. Preferably, in a case that the traffic channel carrying the public message has a control channel scheduling indication, the control channel corresponding to the traffic channel carrying the sm message uses the M-SI-RNTI or the SI-RNTI to scramble the CRC bit, where the M-SI The value of the -RNTI is different from the value of the SI-RNTI. Preferably, the physical downlink control channel scrambled by the M-SI-RNTI and the physical downlink traffic channel (also referred to as a physical downlink shared channel) scheduled by the physical downlink control channel are transmitted in the same subframe or different subframes. The present embodiment further provides a method for receiving a public message, including the following steps: The user equipment receives a public message at a specific time-frequency resource location according to the coverage level, where the specific time-frequency resource location is determined by the network side, The public message is carried on the traffic channel. Through the foregoing steps, the user equipment receives the public message according to the coverage level at a specific time-frequency resource location determined by the network side, thereby providing a method for transmitting the public message in the coverage-enhanced scenario, thereby being able to solve the problem that the public search space is limited. In the case of a large number of repeated transmissions, the problem of increased blocking rate ensures the normal and stable operation of the system. Preferably, the traffic channel is repeatedly received at a time-frequency resource location, wherein the number of repetitions of the traffic channel is determined by at least one of the following: 1. The number of repetitions of the traffic channel carrying the public message is different from the control of scrambling with the C-RNTI The number of repetitions of the traffic channel scheduled by the channel-scrambled control channel;

2. The number of repetitions of the traffic channel carrying the public message is the same;

3. Determine the number of repetitions of the corresponding service channel according to the type of the public message carried. Preferably, the public message includes at least one of the following types of messages: an SIB message, a RAR message, and a Paging message. Preferably, determining the number of repetitions of the corresponding service channel according to the type of the public message to be carried comprises at least one of the following:

Determining the number of repetitions of the traffic channel carrying the sm message according to at least one of the repetition number of the broadcast channel, the maximum coverage level, the periodic configuration of the sm message, or the first predefined value; 2. randomly according to the user equipment The number of repetitions of the traffic channel carrying the RAR message is determined by at least one of a preamble transmitted in the access, a maximum coverage level of the base station, a coverage level of the user equipment, or a second predefined value.

Determining the number of repetitions of the traffic channel carrying the Paging message according to one of the preamble, the maximum coverage level, the coverage level of the user equipment, the RRC signaling, or the third predefined value sent by the user equipment in the random access. . Preferably, determining, according to the preamble sent by the user equipment in the random access, the number of repetitions of the traffic channel carrying the RAR message or the Paging message includes: determining, according to the preamble time-frequency resource or the preamble sequence, the service carrying the RAR message or the Paging message The number of repetitions of the channel. Preferably, the traffic channel carrying the sm message is repeatedly received repeatedly according to a preset period, where the preset period is a period of a fixed duration or a period of a group of durations configured according to a fourth predefined value. Preferably, the traffic channel carrying the sm message is repeatedly received in a preset period, and the one-time repeated reception is located in one or more sm periods. Preferably, in the case that the traffic channel carrying the sm message is sent in a non-periodic manner, receiving the public message at the specific time-frequency resource location comprises: determining, by blind detection, the traffic channel carrying the sm message. Preferably, when the user equipment receives the public message, the method further includes: the user equipment performs a plurality of sm period attempts to decode the service channel carrying the sm message, where the multiple periods include one of the following: 4, 8 , 16, 32, 64. In this way, the number of times the network side repeatedly transmits the traffic channel can be reduced. Preferably, the traffic channel carrying the public message determines the frequency domain resource for repeatedly receiving the traffic channel by using at least one of the following manners without the control channel scheduling indication: 1. In each frequency domain aggregation level, blind detection The number of PRBs in the PRB resources occupied by the frequency domain resources, where BPSK demodulation or QPSK demodulation is adopted on the frequency domain resources, and the CRC bits corresponding to the public message are descrambled by the first RNTI, the second RNTI, and the third RNTI, respectively. The first RNTI includes the SI-RNTI and the M-SI-RNTI with different values, and is used for descrambling the CRC bits corresponding to the SIB message. The second RNTI includes the P-RNTI and the MP-RNTI with different values. The descrambling of the CRC bit corresponding to the Paging message; the third RNTI includes the RA-RNTI and the M-RA-RNTI with different values, and is used for descrambling the CRC bit corresponding to the RAR message;

3. Determine the PRB resource occupied by the frequency domain resource according to the fifth predefined value. Preferably, the starting position of the PRB resource is determined by one of the following methods: 1. Determine the PRB resource with the smallest number in the PRB resource as the starting position; 2. Determine the PRB resource with the largest number in the PRB resource as the starting position; 3. Determine the starting position of the PRB resource according to the formula ^^ + ¹¹ ^^^^"^', where the L aggregation level; = 0 ⁴ '" 77 ) 1110 (11) or ₌ (^»^." ₇₇ ) ₁ 110(11) _{; w =} i,2,..., ⁽ⁱ⁾ . M ( ^L ) denotes the number of candidate sets corresponding to the aggregation level L; ^ denotes the subframe with the subframe number k for uncontrolled transmission The total number of PRBs occupied by the traffic channel carrying the public message; D is the constant 65537; A is the constant 39827; k is the subframe number; i=0, ..., L-1 is the search unit corresponding to an aggregation level; n _RNT i represents the RNTI value of the scrambled CRC bit, SFN represents the radio frame number, and mod represents the modulo operation. Preferably, L = 1, 2, 3, 6; ^N ^ ^k = _60. Preferably, in the case of determining the RPB resource occupied by the frequency domain resource according to the indication of the RRC signaling or according to the fifth predefined value, the PRB The resource is a continuous or discrete PRB resource, and the number of PRBs of the RPB resource is less than or equal to 6. Preferably, the starting position of the traffic channel carrying the public message in the subframe of the transport service channel is determined to be

The three OFDM symbols, or, according to the bandwidth of the system, determine the start symbol of the traffic channel carrying the public message in the subframe. Preferably, according to the bandwidth of the system, determining that the starting symbol of the traffic channel carrying the public message in the subframe includes one of the following: 1. In the case that the system bandwidth is 1.4 MHz, determining the fifth OFDM of the subframe The symbol is the starting symbol;

2. In the case where the system bandwidth is greater than 1.4 MHz, the fourth OFDM symbol of the subframe is determined to be the start symbol. Preferably, the time-frequency resource location occupied by the traffic channel carrying the sm message in the case of a larger coverage level includes a specific time-frequency resource location occupied by the smaller coverage level. Preferably, the starting position of the subframe for receiving the traffic channel is determined by one of the following ways:

1. Determine, according to the type of the public message that is carried, a starting position of the subframe by using a sixth predefined value;

2. Determine a starting position of a subframe for transmitting a traffic channel carrying the sm message according to the κ value, where the κ value satisfies the relation (K + h*n) mod M=i, where K represents the starting position The number of available downlink subframes in the subframe in the radio frame, 0 K hl, n indicates the radio frame in which the subframe at the start position is located, h is the number of available downlink subframes included in one radio frame, and M indicates the interval. The period of repeated transmission, 0^i^hl, wherein, in the TDD system, the downlink subframes in the radio frame are re-sequenced sequentially; 3. Determine a starting position of a subframe for transmitting a traffic channel carrying a RAR message or a Paging message according to the L value, where the L value satisfies the relation (L + h*n) mod N=j. Where L represents the number of available downlink subframes in the radio frame in the starting position, 0 L hl, n represents the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, where N is the number of repeated transmissions, 0 j hl, where the downlink subframes in the radio frame are renumbered sequentially in the TDD system;

4. Determine a starting position of a subframe for transmitting a traffic channel carrying the Paging message according to the H value, wherein the H value satisfies the relation (H + h*n) mod T=j. Where H is the number of available downlink subframes in the radio frame in the starting position, 0 H hl, n is the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, T represents the period of repeated transmission, 0 j hl, where, in the TDD system, the downlink subframes in the radio frame are re-ordered sequentially;

And determining, according to one of a subframe in which the preamble sequence of the preamble in the random access, a type of the preamble sequence, a coverage level of the base station corresponding to the preamble, or a seventh predefined value, is used to receive the bearer RAR message. The starting position of the subframe of the traffic channel. Preferably, determining, according to the type of the public message to be carried, the location of the subframe includes at least one of the following: 1. determining, that the subframe for transmitting the traffic channel carrying the RAR message is received in a continuous manner;

3. Determine that the subframe used for transmitting the traffic channel carrying the sm message is received in a cyclically repeated manner. Preferably, in the case that the subframe for determining the traffic channel for transmitting the bearer sm message is received in a cyclically repeated manner, the control channel scheduling the traffic channel is received in the same periodic repetition manner. Preferably, in the case that the traffic channel carrying the public message adopts periodic repeated reception, the frequency domain resources of the traffic channel carrying the public message on the multiple subframes for repeatedly receiving the traffic channel are the same. Preferably, in a case where the traffic channel carrying the public message has a control channel indication, on a plurality of subframes for repeatedly receiving the traffic channel, the control channel corresponding to the traffic channel carrying the public message occupies the same resource. Preferably, the number of repeated receptions of the control channel is determined according to the maximum coverage level or the type of the public message carried by the corresponding traffic channel. Preferably, in a case that the traffic channel carrying the public message has a control channel scheduling indication, the control channel corresponding to the traffic channel carrying the sm message uses the M-SI-RNTI or the SI-RNTI to scramble the CRC bit, where the M-SI The value of the -RNTI is different from the value of the SI-RNTI. Preferably, the physical downlink control channel scrambled by the M-SI-RNTI and the physical downlink traffic channel scheduled by the physical downlink control channel are received in the same subframe or different subframes. The embodiment also provides a public message sending device, which is located on the network side and can be located in the base station, and is used to implement the public message sending method. The device specific implementation process described in the device embodiment is already in the method embodiment. Detailed description has been made and will not be described here. FIG. 4 is a schematic structural diagram of a public message sending apparatus according to an embodiment of the present invention. As shown in FIG. 4, the apparatus includes a first determining module 42 and a sending module 44, wherein the first determining module 42 is set according to a coverage level. Determining the location of the time-frequency resource for transmitting the public message; the sending module 44 is coupled to the first determining module 42 and configured to send the public message through the time-frequency resource location, where the public message is carried on the traffic channel. The modules and units involved in the embodiments of the present invention may be implemented by software, or may be implemented by hardware. The described modules and units in this embodiment may also be disposed in a processor. For example, it may be described as follows: A processor includes a first determining module 42 and a transmitting module 44. The names of the modules do not constitute a limitation on the module itself in some cases. For example, the first determining module may also be described as "a module that is set to determine the location of the time-frequency resource for transmitting the public message according to the coverage level." . Preferably, the traffic channel is repeatedly transmitted at the time-frequency resource location. In the case of repeated transmission, the number of repeated transmissions of the traffic channel may be determined in multiple manners, for example, by using at least one of the following methods: The number of repeated transmissions of the traffic channel of the public message is set in a manner different from the number of repeated transmissions of the traffic channel scheduled by the control channel scrambled by the C-RNTI scrambled control channel;

2. The number of repeated transmissions of the service channel carrying the public message can be set to the same number of repeated transmissions;

3. Determine the number of repeated transmissions of the corresponding service channel according to the type of the public message that is carried, for example, an SIB message, a RAR message, or a Paging message. Preferably, the public message may be at least one of the following types of messages: SIB message, RAR message, Paging message. Preferably, in the foregoing manner, determining the number of repeated transmissions of the corresponding service channel according to the type of the public message to be carried may be in multiple manners, for example: adopting at least one of the following methods: For the sm message, the service channel carrying the sm message may be determined according to at least one of the number of repeated transmissions of the broadcast channel, the maximum coverage level of the base station, the periodic configuration of the sm message, or the first predefined value. Repeated number of transmissions;

For the RAR message, according to at least one of a preamble sent by the user equipment in the random access, a maximum coverage level of the base station, a coverage level of the user equipment, RRC signaling, or a third predefined value, Determine the number of repeated transmissions of the traffic channel carrying the Paging message. Preferably, in the foregoing manner, determining, according to the preamble sent by the user equipment in the random access, the number of repeated transmissions of the traffic channel carrying the RAR message or the Paging message includes: determining the bearer RAR according to the preamble time-frequency resource or the preamble sequence The number of repeated transmissions of the traffic channel of the message or Paging message. Preferably, the traffic channel carrying the sm message may be intermittently and repeatedly transmitted according to a preset period, where the preset period may be a period of a fixed duration or a period of a group of duration configured according to a fourth predefined value, for example, a period fixed setting Set to a different value for a fixed value or in different scenarios. Preferably, the traffic channel carrying the sm message is repeatedly transmitted in a preset period, and the one-time repeated transmission is located in one or more sm periods. Preferably, the traffic channel carrying the sm message is sent in a non-periodic manner, wherein the user equipment can determine the traffic channel carrying the sm message by blind detection. Preferably, in order to reduce the number of transmissions of the traffic channel, the user equipment may perform multiple periodic attempts to decode the traffic channel carrying the sm message. Preferably, the multiple cycles may include one of the following: 4, 8, 16 32, 64. Preferably, the traffic channel carrying the public message can determine the frequency domain resource for repeatedly transmitting the traffic channel in multiple manners without the control channel scheduling indication, for example, by using at least one of the following methods: In the domain aggregation level, determining the number of PRBs in the PRB resources occupied by the frequency domain resources, where BPSK modulation or QPSK modulation is adopted on the comment resources, and the public message is scrambled by the first RNTI, the second RNTI, and the third RNTI, respectively. Corresponding CRC bits; wherein, the first RNTI includes SI-RNTIs and M-SI-RNTIs with different values, and is used for scrambling of CRC bits corresponding to the SIB message; Different P-RNTIs and MP-RNTIs are used for scrambling of CRC bits corresponding to Paging messages. The third RNTI includes RA-RNTIs and M-RA-RNTIs with different values, and is used for adding CRC bits corresponding to RAR messages. Disturb.

3. Determine the starting position of the PRB resource according to the formula ^^ + ¹¹ ^^^ ""^'; where L is the aggregation level; ₌ 0 ⁴ '" 17 )" ¹ 3 or ₌ (^ ^^ . " ₇₇ ) 111 11) _{; w} = l 2 ... M ⁽ⁱ ) (L) represents the number of candidate sets corresponding to the aggregation level L; ^ represents the service carrying the public message for the uncontrolled transmission on the subframe with the subframe number k The total number of PRBs occupied by the channel; D represents a constant 65537; A represents a constant 39827; k represents a subframe number; i=0 ... L-1 represents a search unit corresponding to an aggregation level; _3⁄41 ^ represents an RNTI of a scrambled CRC bit Value, SFN represents the radio frame number, mod represents the modulo operation. Preferably, L = l 2 3 6; ^N ^ ^k = 6 o Preferably, the frequency is determined according to the indication according to the RRC signaling or according to the fifth predefined value In the case of the RPB resource occupied by the domain resource, the PRB resource is a continuous or discrete PRB resource, and the number of PRBs of the RPB resource is less than or equal to 6. Preferably, the service channel carrying the public message is determined to be within the subframe of the transport service channel. The starting position is the third OFDM symbol, or, according to the bandwidth of the system, determining that the traffic channel carrying the public message is within the subframe Preferably, in the case of determining the start symbol of the traffic channel carrying the public message in the subframe according to the bandwidth of the system, including but not limited to adopting one of the following methods:

1. When the system bandwidth is 1.4 MHz, determine that the fifth OFDM symbol of the subframe is a start symbol;

2. In the case where the system bandwidth is greater than 1.4 MHz, the fourth OFDM symbol of the subframe is determined to be the start symbol. Preferably, the time-frequency resource location occupied by the traffic channel carrying the sm message in the case of a larger coverage level includes the time-frequency resource location occupied by the smaller coverage level, that is, as the coverage level increases, before The occupied time-frequency resource location does not change, but a new time-frequency resource location is newly added. Preferably, the manner of determining the starting position of the subframe used for transmitting the traffic channel includes, but is not limited to, the following manners: 1. determining a starting position of the subframe according to a type of the public message that is carried, for example, adopting a sixth pre-defined a value, a traffic channel carrying different types of public messages corresponding to different subframe start positions;

2. Determine a starting position of a subframe for transmitting a traffic channel carrying the sm message according to the κ value, where the κ value satisfies the relation (K + h*n) mod M=i, where K represents the starting position The number of available downlink subframes in the subframe in the radio frame, 0 K hl, n indicates the radio frame in which the subframe at the start position is located, h is the number of available downlink subframes included in one radio frame, and M indicates the interval. The period of repeated transmission, O^i^h-1, wherein, in the TDD system, the downlink subframes in the radio frame are re-sequenced sequentially;

3. Determine a starting position of a subframe for transmitting a traffic channel carrying a RAR message or a Paging message according to the L value, wherein the L value satisfies the relation (L + h*n) mod N=j. Where L represents the number of available downlink subframes in the radio frame in the starting position, 0 L hl, n represents the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, where N is the number of repeated transmissions, 0 j hl, where the downlink subframes in the radio frame are renumbered sequentially in the TDD system;

2. Determining, by using a discrete selection manner, a subframe for transmitting a traffic channel carrying the Paging message; 3. Determine that the subframe used for transmitting the traffic channel carrying the sm message is sent in a cyclically repeated manner. Preferably, in the case that the subframe for determining the traffic channel for transmitting the bearer sm message is transmitted in a cyclically repeated manner, the control channel scheduling the traffic channel is transmitted in the same periodic repetition manner. Preferably, in a case where the traffic channel carrying the public message is periodically transmitted repeatedly, the frequency domain resources of the traffic channel carrying the public message in the multiple subframes for repeatedly transmitting the traffic channel are the same. Preferably, in the case that the traffic channel carrying the public message has a control channel indication, on a plurality of subframes for repeatedly transmitting the traffic channel, the control channel corresponding to the traffic channel carrying the public message occupies the same resource size. Preferably, the number of repeated transmissions of the control channel may also be determined according to the maximum coverage level of the base station or the type of the public message carried by the corresponding traffic channel. Preferably, in a case that the traffic channel carrying the public message has a control channel scheduling indication, the control channel corresponding to the traffic channel carrying the sm message uses the M-SI-RNTI or the SI-RNTI to scramble the CRC bit, where the M-SI The value of the -RNTI is different from the value of the SI-RNTI. Preferably, the physical downlink control channel scrambled by the M-SI-RNTI and the physical downlink traffic channel (also referred to as a physical downlink shared channel) scheduled by the physical downlink control channel are transmitted in the same subframe or different subframes. The embodiment further provides a public message receiving device, which is located at the terminal side, and can be located in the user equipment, and is configured to implement the public message receiving method. The specific implementation process of the device described in the device embodiment is in the method embodiment. It has been described in detail and will not be described here. The public message receiving apparatus includes a receiving module, configured to receive a public message at a specific time-frequency resource location according to a coverage level, where the specific time-frequency resource location is determined by the network side, and the public message is carried on the traffic channel. . Preferably, the traffic channel is repeatedly received at a time-frequency resource location, where the number of repetitions of the traffic channel is determined by at least one of the following:

1. The number of repetitions of the traffic channel carrying the public message is different from the number of repetitions of the traffic channel scheduled by the control channel scrambled by the C-RNTI scrambled control channel;

3. Determine the number of repetitions of the corresponding service channel according to the type of the public message carried. Preferably, the public message includes at least one of the following types of messages: an SIB message, a RAR message, and a Paging message. Preferably, determining, according to the type of the public message to be carried, the number of repetitions of the corresponding service channel includes at least one of the following: 1. According to the repetition number of the broadcast channel, the maximum coverage level, the periodic configuration of the sm message, or the first predefined value. At least one of the manners of determining the number of repetitions of the traffic channel carrying the sm message;

2. Determine the number of repetitions of the traffic channel carrying the RAR message according to at least one of the preamble sent by the user equipment in the random access, the maximum coverage level of the base station, the coverage level of the user equipment, or the second predefined value. Determining, according to one of the preamble, the maximum coverage level of the base station, the coverage level of the user equipment, the RRC signaling, or the third predefined value sent by the user equipment in the random access, the service channel carrying the Paging message is determined. repeat times. Preferably, determining, according to the preamble sent by the user equipment in the random access, the number of repetitions of the traffic channel carrying the RAR message or the Paging message includes: determining, according to the preamble time-frequency resource or the preamble sequence, the service carrying the RAR message or the Paging message The number of repetitions of the channel. Preferably, the traffic channel carrying the sm message is intermittently repeatedly received according to a preset period, wherein the preset period is a period of a fixed duration or a period of a group of durations configured according to the fourth predefined value. Preferably, the traffic channel carrying the sm message is repeatedly received in a preset period, and the one-time repeated reception is located in one or more sm periods. Preferably, in the case that the traffic channel carrying the sm message is sent in a non-periodic manner, receiving the public message at the specific time-frequency resource location comprises: determining, by blind detection, the traffic channel carrying the sm message. The public message transmitting apparatus performs a plurality of sm cycle attempts to decode the traffic channel carrying the sm message to reduce the number of times the network side repeatedly transmits the traffic channel. Among them, multiple cycles include one of the following: 4, 8, 16, 32, and 64. Preferably, the traffic channel carrying the public message determines the frequency domain resource for repeatedly receiving the traffic channel by using at least one of the following manners without the control channel scheduling indication:

1. In each frequency domain aggregation level, blindly check the number of PRBs in the PRB resources occupied by the frequency domain resources, where BPSK demodulation or QPSK demodulation is adopted on the frequency domain resources, and the first RNTI and the second RNTI are respectively adopted. The CRC bit corresponding to the third RNTI descrambled public message; wherein, the first RNTI includes the SI-RNTI and the M-SI-RNTI with different values, and is used for descrambling the CRC bit corresponding to the SIB message; The P-RNTI and the MP-RNTI with different values are used for descrambling the CRC bits corresponding to the Paging message. The third RNTI includes the RA-RNTI and the M-RA-RNTI with different values, and is used for the CRC bits corresponding to the RAR message. De-scrambling; 2. determining a PRB resource occupied by the frequency domain resource according to the indication of the RRC signaling;

3. Determine the PRB resource occupied by the frequency domain resource according to the fifth predefined value. Preferably, the starting position of the PRB resource is determined by one of the following:

2. Determine the PRB resource with the highest number in the PRB resource as the starting position; 3. Determine the starting position of the PRB resource according to the formula ^^ ^) ¹¹ ^^^^"^', where the L aggregation level; = 4 '" ₇₇ ) 1110(^ or ₌ (^ »^ . _1⁄2 ^ ) ₁ 110(^ _{; M = 2} „„, M ^(L) . M ( ^L ) denotes the number of candidate sets corresponding to the aggregation level L; ^ denotes the subframe number The total number of PRBs occupied by the traffic channel carrying the public message for the uncontrolled transmission on the subframe of k; D is the constant 65537; A is the constant 39827; k is the subframe number; i=0, ..., L-1 Indicates the search unit corresponding to an aggregation level; ^!^ indicates the RNTI value of the scrambled CRC bit, SFN indicates the radio frame number, and mod indicates the modulo operation. Preferably, L = 1, 2, 3, 6; ^N ^ ^k = ₆₀ preferably, in the RRC signaling or indication according to a fifth predefined value, the determined frequency domain resources occupied resources RPB case, PRB resources for continuous or discrete resource PRB, PRB and the number of resources is less than RPB Or equal to 6. Preferably, determining that the starting location of the traffic channel carrying the public message in the subframe of the transport traffic channel is the third OFDM symbol, or Determining, according to the bandwidth of the system, a start symbol of the traffic channel carrying the public message in the subframe. Preferably, according to the bandwidth of the system, determining that the start symbol of the traffic channel carrying the public message in the subframe includes one of the following: the way:

1. When the system bandwidth is 1.4 MHz, determine that the fifth OFDM symbol of the subframe is the start symbol; 2. In the case that the system bandwidth is greater than 1.4 MHz, determine the fourth OFDM symbol of the subframe as the start. symbol. Preferably, the time-frequency resource location occupied by the traffic channel carrying the sm message in the case of a larger coverage level includes a specific time-frequency resource location occupied by the smaller coverage level. Preferably, the starting position of the subframe for receiving the traffic channel is determined by one of the following ways:

1. Determine, according to the type of the public message to be carried, a starting position of the subframe by using a sixth predefined value; 2. Determine a starting position of the subframe used for transmitting the traffic channel carrying the sm message according to the κ value, where, K The value satisfies the relationship (K + h*n) mod M=i, where K represents the number of available downlink subframes in the radio frame of the subframe at the start position, 0 K hl, n represents the child at the start position The radio frame in which the frame is located, h is the number of available downlink subframes included in one radio frame, and M is the period of intermittent retransmission, 0^i^hl, where the downlink subframe is re-used in the TDD system according to the available downlink subframes in the radio frame. Performing sequence numbering; 3. Determining, according to the L value, a starting position of a subframe for transmitting a traffic channel carrying a RAR message or a Paging message, wherein the L value satisfies a relation (L + h*n) mod N=j. Where L represents the number of available downlink subframes in the radio frame in the starting position, 0 L hl, n represents the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, N is the number of repeated transmissions, 0 j hl, where, in the TDD system, the downlink subframes in the radio frame are re-sequenced sequentially; 4. The sub-carriers for transmitting the traffic channel carrying the Paging message are determined according to the H value. The starting position of the frame, where

The H value satisfies the relationship (H + h*n) mod T=j. Where H is the number of available downlink subframes in the radio frame in the starting position, 0 H hl, n is the radio frame in the subframe where the starting position is located, and h is the available downlink included in one radio frame. The number of subframes, T represents the period of repeated transmission, 0 j hl, where, in the TDD system, the downlink subframes in the radio frame are re-sequenced sequentially; 5. According to the subframe in which the preamble sequence of the preamble in the random access is located And determining, by one of a type of the preamble sequence, a coverage level of the base station corresponding to the preamble, or a seventh predefined value, a starting position of the subframe used for receiving the traffic channel carrying the RAR message. Preferably, determining the location of the subframe includes at least one of the following according to the type of the public message that is carried:

1. Determine that a subframe for transmitting a traffic channel carrying the RAR message is received in a continuous manner; 2. determining, by using a discrete selection manner, a subframe for transmitting a traffic channel carrying the Paging message;

3. Determine that the subframe used for transmitting the traffic channel carrying the sm message is received in a cyclically repeated manner. Preferably, in the case that the subframe for determining the traffic channel for transmitting the bearer sm message is received in a cyclically repeated manner, the control channel scheduling the traffic channel is received in the same periodic repetition manner. Preferably, in the case that the traffic channel carrying the public message adopts periodic repeated reception, the frequency domain resources of the traffic channel carrying the public message on the multiple subframes for repeatedly receiving the traffic channel are the same. Preferably, in a case where the traffic channel carrying the public message has a control channel indication, on a plurality of subframes for repeatedly receiving the traffic channel, the control channel corresponding to the traffic channel carrying the public message occupies the same resource. Preferably, the number of repeated receptions of the control channel is determined according to the maximum coverage level or the type of the public message carried by the corresponding traffic channel. Preferably, in a case that the traffic channel carrying the public message has a control channel scheduling indication, the control channel corresponding to the traffic channel carrying the sm message uses the M-SI-RNTI or the SI-RNTI to scramble the CRC bit, where the M-SI The value of the -RNTI is different from the value of the SI-RNTI. Preferably, the physical downlink control channel scrambled by the M-SI-RNTI and the physical downlink traffic channel scheduled by the physical downlink control channel are received in the same subframe or different subframes. It should be noted that the above-mentioned "first predefined value" and "second predefined value" refer to one or more sets of correspondences that can be configured by the user, among which "first", "second", etc. Used to identify these predefined values to indicate that these predefined values do not have to be the same predefined value, but they are not limited to pre-defined values that are different. In some cases, these predefined values are Some of them can be the same. The embodiment of the present invention further provides a public message transmission system. FIG. 5 is a structural block diagram of a public message transmission system according to an embodiment of the present invention. As shown in FIG. 5, the system includes the public message sending device 52 and the public message. Receiving device 54. Description and description are made below in conjunction with the preferred embodiments. The preferred embodiment provides a method for transmitting a public message in an LTE/LTE-A system to support coverage enhancement requirements of a control channel by repeated transmission. The method for transmitting a public message proposed in the preferred embodiment can solve the problem that a terminal having coverage enhancement requirements receives a public message in an LTE system, and ensures normal communication requirements of the terminal device under the premise of reducing control overhead. The preferred embodiment provides a method for transmitting a public message, which is applied to a network side device, and the method includes: the base station selects a specific time-frequency resource location to transmit a public message according to the coverage level, where the public message is carried over the service channel, and the bearer is carried. The number of service channel repetitions of the public message satisfies at least one of the following criteria: Criterion 1: The number of repetitions of the traffic channel carrying the SIB, RAR, and Paging messages is different from the number of repetitions of the traffic channel scheduled by the control channel scrambled by the C-RNTI. Rule 2: The number of repetitions of the service channel carrying the SIB, RAR, and Paging messages is the same; criterion 3: determining the number of repetitions of the service channel carrying the public message according to the public message type; preferably, determining the bearer of the public message according to the public message type The number of repetitions of the traffic channel, including at least one of the following: The number of repetitions of the traffic channel carrying the sm message is determined according to the number of repetitions of the broadcast channel or determined according to the maximum coverage level or determined according to the periodic configuration of the sm; the service carrying the RAR message The number of channel repetitions is determined according to a preamble sent by the UE in random access, or determined according to a maximum coverage level; or, or determined according to a predefined value; the number of service channel repetitions carrying the paging message is according to the UE in random access. The received Preamble is determined, or determined according to the maximum coverage level; or determined according to signaling, or determined according to a predefined value; preferably, determining according to the Preamble sent by the terminal includes: determining according to the time-frequency resource of the Preamble, or the Preamble sequence. Preferably, the traffic channel carrying the sm message is intermittently transmitted in a period M, where M is a fixed value or a set of values. For example, only one repetition is sent in cycle M, and repeated transmissions are in one or more sm cycles. Preferably, the base station repeatedly transmits in an aperiodic manner, and the terminal blindly detects the repeated transmission of the traffic channel carrying the sm message. Preferably, the traffic channel carrying the sm message can reduce the number of repeated transmissions by attempting to decode through multiple sm periods, and the preferred number of cycles is 4, 8, 16, 32, 64. Preferably, the service channel carrying the public message repeatedly transmits the frequency domain resource in the absence of the control channel scheduling indication, and includes at least one of the following manners: Mode 1: The number of PRBs occupied by the frequency channel of the repeatedly transmitted traffic channel is in the frequency domain aggregation level. Optional 1, 2, 3, and 6. The Modulation and Coding Scheme (MCS) level is fixed using QPSK or BPSK modulation. The CRC bits are scrambled by X-RNTI (corresponding to the first RNTI), Y-RNTI (corresponding to the second RNTI), and Z-RNTI (corresponding to the third RNTI). The X-RNTI includes SI-RNTI and M-SI-RNTI, The Y-RNTI includes a P-RNTI and a PMP-RNTI, and the Z-RNTI includes an RA-RNTI and a P-M-RA-RNTI, where the M-SI-RNTI MP-RNTI and the M-RA-RNTI and the SI-RNTI P-RNTI It is different from the value of RA-RNTI. Manner 2: The PRB resources occupied by the frequency domain of the repeated transmission traffic channel are indicated by RRC signaling. Manner 3: The PRB resources occupied by the frequency domain of the repeated transmission traffic channel are predefined. Preferably, the starting position of the PRB starts from the smallest or largest PRB number, or the starting position of the PRB is determined by the formula Ζ '

₊ determined, where _L=1 , ₂ , ₃ , ₆ ; = ^ mcxi or

Y _{k =} (A - k - SFN - ) mod _{m = 2} , ..., M ^(L) . ^N s, k _{= 6.} Preferably, for the second mode and the third mode described above, the allocated PRB resources may Is continuous or discrete, and no more than 6 PRBs. Preferably, the repeated transmission of the traffic channel is determined according to the system bandwidth in each subframe. When the system bandwidth is 1.4 MHz, the detection starts from the 5th OFDM symbol. When the system bandwidth is >1.4MHz, it is fixedly detected from the 4th OFDM symbol. Alternatively, the repeated transmission of the traffic channel starts from the third OFDM symbol uniformly in each subframe. Preferably, FIG. 6a to FIG. 6c are schematic diagrams of resources occupied by the primary, secondary, and tertiary levels, respectively, according to a preferred embodiment of the present invention. As shown in FIG. 6a to FIG. 6c, the repeated transmission of the traffic channel bearer In SIB, the resources occupied when the large coverage level contains the resources occupied by the small coverage level. Preferably, the subframe start position of the repeatedly transmitted traffic channel is determined by one of the following manners: Mode 1: The start positions of the subframes of the traffic channel carrying the SIB RAR Paging message are independently configured; Method 2: Repeat transmission of the bearer sm message The subframe start position k of the traffic channel satisfies the relationship (k + h*n) mod M=i. Where k is the number of the downlink subframes available for the start subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), 0^k^hl, where n indicates the radio frame where the start subframe k is located. h is the number of available downlink subframes included in one radio frame, M represents the period of intermittent retransmission, 0 i hl ; mode 3: the subframe start position k of the traffic channel carrying the repeated transmission of the RAR paging message satisfies the relationship ( k + h*n) mod N=j. Where k is the number of the downlink subframes available for the starting subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), 0^k^hl, where n represents the radio frame where the starting subframe k is located. , h is the number of available downlink subframes included in one radio frame, and N is the number of repeated transmissions, 0 j hl ; Manner 4: The starting subframe of the RAR is determined according to the subframe in which the Preamble sequence is located, or determined according to the type of the Preamble sequence, or determined according to the coverage level corresponding to the Preamble, or determined according to a predefined coverage level. Preferably, the subframe position of the repeatedly transmitted traffic channel is determined by the bearer public message type, and includes: mode 1: RAR corresponding subframe is divided into consecutive modes; mode 2: Paging corresponding subframe is discrete selection mode; mode 3: Sm corresponds to the periodic repeat transmission method. Preferably, when the public message adopts the periodic repeat transmission mode, the frequency domain locations of the service channels carrying the public message on the repeated transmission subframes are the same. Preferably, if the traffic channel carrying the public message has the control channel scheduling indication, the resources of the control channel corresponding to the traffic channel carrying the public message on the repeated transmission subframe are the same; preferably, the number of repetitions of the control channel is shown Determine according to the maximum coverage level, or determine the number of repetitions based on the public message type (SIB, RAR, Paging). Preferably, the traffic channel carrying the public message has a control channel scheduling indication, and the control channel corresponding to the traffic channel carrying the sm message uses the M-SI-RNTI or the SI-RNTI to scramble the CRC bit, where, the M-SI- The RNTI is a predefined value different from the value of the SI-RNTI. Preferably, the M-SI-RNTI scrambled PDCCH and the scheduled PDSCH may be in the same subframe or different subframes; the preferred embodiment further provides a public message transmission method, which is applied to the terminal side device, the method The method includes: a terminal (corresponding to the foregoing user equipment), according to the coverage level, selecting a specific time-frequency resource location to detect a public message, where the public message is carried by the service channel, and the number of service channel repetitions carrying the public message satisfies at least one of the following criteria: 1: The number of repetitions of the traffic channel carrying the SIB, RAR, and Paging messages is different from the number of repetitions of the traffic channel scheduled by the control channel scrambled by the C-RNTI. Rule 2: The number of repetitions of the traffic channel carrying the SIB, RAR, and Paging messages is the same; Rule 3: Determine the number of repetitions of the traffic channel carrying the public message according to the public message type. Preferably, the terminal is an MTC terminal. Preferably, the number of repetitions of the traffic channel carrying the public message is determined according to the public message type, and specifically includes at least one of the following: The number of repetitions of the traffic channel carrying the sm message is determined according to the number of repetitions of the broadcast channel or determined according to the maximum coverage level or according to the sm The period configuration determines or pre-defined values; the number of service channel repetitions carrying the RAR message is determined according to the Preamble sent by the UE in the random access, or is determined according to the maximum coverage level; or, according to a predefined value; the service carrying the paging message The number of channel repetitions is determined according to the Preamble sent by the UE in the random access, or determined according to the maximum coverage level; or determined according to RRC signaling, or determined according to a predefined value; preferably, determining according to the Preamble sent by the UE includes: Preamble's time-frequency resource or Preamble sequence is determined. Preferably, the traffic channel carrying the sm message is intermittently transmitted in a period M, where M is a fixed value or a set of values. For example, in a period M, only one combined reception is performed, and the repeated transmission is located in one or more sm periods. Preferably, the base station repeatedly transmits in an aperiodic manner, and the terminal blindly detects the repeated transmission of the traffic channel carrying the sm message. Preferably, the traffic channel carrying the sm message, the terminal may try to decode by multiple cycles to reduce the number of repeated transmissions, and the preferred number of multiple cycles is 4, 8, 16, 32, 64. Preferably, the service channel carrying the public message repeatedly transmits the frequency domain resource in the absence of the control channel scheduling indication, and includes at least one of the following manners: Mode 1: The number of PRBs occupied by the frequency channel of the repeatedly transmitted traffic channel is in the frequency domain aggregation level. Optional 1, 2, 3, and 6. The MCS level is fixed using BPSK or QPSK demodulation. The CRC bits are descrambled by X-RNTI, Y-RNTI Z-RNTI. The X-RNTI includes the SI-RNTI and the P-M-SI-RNTI, the Y-RNTI includes the P-RNTI and the MP-RNTI, and the Z-RNTI includes the RA-RNTI and the M-RA-RNTI, where the M-SI-RNTI, the MP- The values of RNTI and M-RA-RNTI are different from those of SI-RNTI, P-RNTI, and RA-RNTI. Manner 2: The PRB resources occupied by the frequency domain of the repeated transmission traffic channel are indicated by RRC signaling. Manner 3: The PRB resources occupied by the frequency domain of the repeated transmission traffic channel are predefined. Preferably, the starting position of the PRB starts from the smallest or largest PRB number, or the starting position of the PRB is determined by the formula . ^ ) ηκχΐμ / ”} + , where _L=1 , ₂ , ₃ , 6; = xia) mod or

Y _k = ( ^A - ^k - ^SFN . " Li ) mod ; _{m =} ι, 2, ..., M ^L) . ^N i > Tm, k _{= 6.} Preferably, for the above mode two and mode three, The allocated PRB resources may be continuous or discrete, and no more than 6 PRBs. Preferably, the repeated transmission of the traffic channel is determined according to the system bandwidth in each subframe, and when the system bandwidth is 1.4 MHz, the fixed from the first The 5 OFDM symbols start to detect, and when the system bandwidth is >1.4 MHz, the detection starts from the 4th OFDM symbol. Alternatively, the repeated transmission of the traffic channel starts from the 3rd OFDM symbol uniformly in each subframe. As shown in FIG. 6, when the retransmitted traffic channel carries sm, the resources occupied when the large coverage level includes the resources occupied by the small coverage level. Preferably, the subframe start position of the repeatedly transmitted traffic channel is as follows: One of the modes is determined as follows: Mode 1: The start position of the subframe of the service channel carrying the SIB, RAR, and Paging messages is independently configured. Mode 2: The start position k of the service channel carrying the sm message repeatedly transmitted satisfies the relationship ( k + h*n) mod M=i. where k Indicates the number of available downlink subframes in the radio frame (in TDD, the number of downlink sub-frames in the radio frame is reordered), 0^k^hl, where n indicates the radio frame where the starting subframe k is located, h For the number of available downlink subframes included in a radio frame, M denotes the period of intermittent repeated transmission, 0 i hl. Mode 3: The start position k of the traffic channel carrying the RAR and paging message repeated transmission satisfies the relationship (k) + h*n) mod N=j, where k is the number of the downlink subframes available for the starting subframe in the radio frame (in TDD, the number of available downlink subframes in the radio frame is reordered), 0^k^hl , n Indicates the radio frame where the starting subframe k is located, h is the number of available downlink subframes included in one radio frame, and N indicates the number of repeated transmissions, 0 j hl. Mode 4: The starting subframe of the RAR is based on the Preamble sequence. The subframe is determined, or determined according to the type of the Preamble sequence, or determined according to the coverage level corresponding to the Preamble, or determined according to a predefined coverage level; preferably, the subframe position of the repeatedly transmitted traffic channel is carried by the bearer. The public message type is determined, and specifically includes: mode 1: RAR corresponding subframe is divided into consecutive modes; mode 2: Paging corresponding subframe is a discrete selection mode; Mode 3: sm corresponds to a periodic repeating transmission mode. Preferably, when the public message adopts the cyclic repeat receiving mode, the frequency domain location of the traffic channel carrying the public message on the repeated receiving subframe is the same; preferably, the traffic channel carrying the public message is in existence In the case of the control channel scheduling indication, the resources of the control channel corresponding to the traffic channel carrying the public message on the repeated transmission subframe are the same; preferably, the number of repetitions of the control channel is determined according to the maximum coverage level, or according to the public message type. (SIB, RAR, Paging) Determine the number of repetitions. Preferably, the traffic channel carrying the public message has a control channel scheduling indication, and the control channel corresponding to the traffic channel carrying the sm message uses the M-SI-RNTI or the SI-RNTI to scramble the CRC, where the M-SI-RNTI A predefined value that is different from the value of the SI-RNTI. Preferably, the M-SI-RNTI scrambled PDCCH and the scheduled PDSCH may be in the same subframe or different subframes; the preferred embodiment of the present invention is further illustrated below. The technical solution adopted in the preferred message in the preferred embodiment is: the base station selects a specific time-frequency resource location to transmit a public message according to the coverage level, where the public message is carried over the service channel. The number of repetitions of the traffic channel carrying the public message satisfies at least one of the following criteria: Rule 1: The number of repetitions of the traffic channel carrying the SIB, RAR, and Paging messages is different from the number of repetitions of the traffic channel scheduled by the control channel scrambled by the C-RNTI. For example, the number of repetitions of the traffic channel carrying the SIB, RAR, and Paging messages may be transmitted in the number of repetitions corresponding to the maximum coverage level of the cell, and the traffic channel scheduled by the C-RNTI-scrambled control channel carries user-specific information. At this time, the corresponding repetition times can be transmitted in combination with the specific coverage level of the terminal. Rule 2: The number of repetitions of the traffic channel carrying the SIB, RAR, and Paging messages is the same; Rule 3: Determine the number of repetitions of the traffic channel carrying the public message according to the public message type; for example, the SIB is determined according to the maximum coverage level, and the RAR is based on the UE. The Preamble sent during the random access procedure determines that Paging is determined according to RRC signaling or UE coverage level. The manner in which the service channel repeatedly transmits the occupied resources includes the corresponding occupied resources when the occupied resource includes the low coverage level when the high coverage level is included. Preferably, the number of repetitions of the traffic channel carrying the public message is determined according to the public message type, and specifically includes at least one of the following: The number of repetitions of the traffic channel carrying the sm message is determined according to the number of repetitions of the broadcast channel or determined according to the maximum coverage level or according to the sm For example, when the number of repetitions of the traffic channel carrying the sm message is determined according to the number of repetitions of the broadcast channel, the terminal first receives the broadcast message of the base station, and the number of repetitions of the broadcast channel corresponds to the traffic channel carrying the sm message. The number of repetitions. When the number of service channel repetitions of the sm message is determined according to the maximum coverage level, since the public message is sent to all the terminals in the cell, when the coverage is increased, the sm message can be sent according to the repetition number corresponding to the maximum coverage level. Traffic channel. When the number of service channel repetitions carrying the sm message is determined according to the periodic configuration of sm, the number of repetitions is determined in consecutive sm periods within the range of the sm update period. When the number of service channel repetitions carrying the sm message is determined according to a predefined value, the predefined value is used as the number of repetitions. The number of repetitions of the service channel that carries the RAR message is determined according to the Preamble sent by the UE in the random access procedure, or is determined according to the maximum coverage level; or a predefined value; the number of repetitions of the service channel carrying the paging message is determined according to the coverage level of the UE, or Determined according to the maximum coverage level; or, determined according to signaling, or a predefined value; specifically, the signaling is located in the sm or the main information block

(Master Information Block, abbreviated as MIB), or RRC signaling. Preferably, the number of repetitions of the repeatedly transmitted traffic channel is a predefined fixed value, and the predefined value is selected in a limited set, and the preferred limited set is {2, 4, 10, 20, 50, 100, 200, 400} . The repeated subframes of the repeatedly transmitted traffic channel are occupied continuously or in a predefined manner. Preferably, the determining according to the Preamble sent by the terminal comprises: according to the time-frequency resource of the Preamble and/or

The Preamble sequence is determined. Preferably, the traffic channel carrying the sm message is intermittently transmitted in a period M, where M is a fixed value or a set of values. For example, only one repetition is sent in cycle M, and repeated transmissions are in one or more sm cycles. Preferably, the base station repeatedly transmits in an aperiodic manner, and the terminal blindly detects the repeated transmission of the traffic channel carrying the sm message. Preferably, the dense repeated transmission of the traffic channel carrying the sm message is performed only once in the period M, thereby ensuring the normal communication requirement of the legacy terminal. The preferred values for the period M are 80ms, 160ms, 320ms, 640ms, 1280ms, 5120ms, 10240ms. Preferably, the traffic channel carrying the sm message can reduce the number of repeated transmissions by attempting decoding by multiple cycles, and the preferred number of cycles is 4, 8, 16, 32, 64. For example, demodulation N times in N cycles, as long as one demodulation is correct, it is considered that the corresponding sm message can be correctly obtained. Preferably, the service channel carrying the public message repeatedly transmits the frequency domain resource in the absence of the control channel scheduling indication, and includes at least one of the following manners: Mode 1: The number of PRBs occupied by the frequency channel of the repeatedly transmitted traffic channel is in the frequency domain aggregation level. Optional 1, 2, 3, and 6. The MCS level is fixed using BPSK or QPSK modulation. The CRC bits are scrambled by X-RNTI, Y-RNTI, Z-RNTI. The X-RNTI includes the SI-RNTI and the P-M-SI-RNTI, the Y-RNTI includes the P-RNTI and the MP-RNTI, and the Z-RNTI includes the RA-RNTI and the M-RA-RNTI, where the M-SI-RNTI, the MP- The values of RNTI and M-RA-RNTI are different from those of SI-RNTI, P-RNTI, and RA-RNTI. For example, the M-SI-RNTI is different from the value of the SI-RNTI, and the value ranges from 0001 to FFFC. The value of the MP-RNTI is different from that of the P-RNTI, and the value ranges from 0001 to FFFC. The value of the M-RA-RNTI is different from that of the RA-RNTI, and the value ranges from 003D to FFFC. Manner 2: The PRB resources occupied by the frequency domain of the repeated transmission traffic channel are indicated by RRC signaling. Manner 3: The PRB resources occupied by the frequency domain of the repeated transmission traffic channel are predefined. Preferably, in the first method, the terminal needs to blindly detect the PRB resources of the traffic channel carrying the public message, and sequentially detect the corresponding candidate set according to the aggregation level. In mode 2 or mode 3, the terminal learns the PRB resource location of the service channel carrying the public message through RRC signaling or a predefined manner, and directly detects the public message in the corresponding PRB resource. Preferably, the starting position of the PRB starts from the smallest or largest PRB number, or the starting position of the PRB is determined by the formula + ', where _L=1 , ₂ , ₃ , 6; O^^^Jmcxi or Y _{k =} (A - k - SFN - _nRNTI ) modD; _{m = 1} '2,..., M ^(L) . W _PRB , _{t =6 ;} — Possible search spaces are shown in Table 1. Table 1 PRB search space

Preferably, for mode 2 and mode 3, the allocated PRB resources may be continuous or discrete, and no more than 6 PRBs. Preferably, the repeated transmission of the traffic channel is determined according to the system bandwidth in each subframe. For example, when the system bandwidth is 1.4 MHz, the detection starts from the 5th OFDM symbol, and when the system bandwidth is >1.4 MHz, the fixed slave is fixed. The 4th OFDM symbol starts detection. Alternatively, the repeated transmission of the traffic channel starts from the third OFDM symbol uniformly in each subframe. Preferably, as shown in FIG. 6, when the repeatedly transmitted traffic channel carries sm, the resources occupied when the large coverage level contains resources occupied by the small coverage level. Preferably, the subframe start position of the repeatedly transmitted traffic channel is determined by one of the following manners: Mode 1: The subframe start positions of the traffic channels carrying the SIB, RAR, and Paging messages are independently configured. Manner 2: The subframe start position k of the traffic channel carrying the sm message repeated transmission satisfies the relation (k + h*n) mod M=i. Where k is the number of the downlink subframes available for the start subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), 0^k^hl, where n indicates the radio frame where the start subframe k is located. , h is the number of available downlink subframes contained in one radio frame, and M is the period of intermittent retransmission, 0 i hl. Specifically, i preferably has a value of 4 or 5 or 9. Manner 3: The subframe start position k of the traffic channel carrying the repeated transmission of the RAR and the paging message satisfies the relation (k + h*n) mod N=j. Where k is the number of the downlink subframes available for the starting subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), 0^k^hl, where n represents the radio frame where the starting subframe k is located. , h is the number of available downlink subframes included in one radio frame, and N is the number of repeated transmissions, 0 j hl. Specifically, j is preferably 0 or 5 when the Paging message is carried. Manner 4: The starting subframe of the RAR is determined according to the subframe in which the Preamble sequence is located, or determined according to the type of the Preamble sequence, or determined according to the coverage level corresponding to the Preamble, or determined according to a predefined coverage level; The subframe position used by the retransmitted traffic channel is determined by the bearer public message type, and includes: mode 1: RAR corresponding subframe is divided into consecutive modes; mode 2: Paging corresponding subframe is discrete selection mode; specifically, including The signaling configuration corresponds to a subframe. For example: Y radio frames are one transmission period, and there are X specific positions that can be transmitted in one transmission period, and each X is specifically a continuous subframe or a discrete subframe; Mode 3: sm corresponds to a periodic repeat transmission mode; specifically, the transmission is sent according to a period M1 including an integer multiple of the sm message period, and the terminal merges and decodes in the period M1, wherein the period M1 is smaller than the update period of the sm message. Preferably, when the public message adopts the cyclically repeated transmission mode, the frequency domain location of the traffic channel carrying the public message on the repeated transmission subframe is the same; preferably, the traffic channel carrying the public message is repeated in the case of the control channel scheduling indication. The resources of the control channel corresponding to the service channel carrying the public message on the transmitting subframe are the same; preferably, the number of repetitions of the control channel is determined according to the maximum coverage level, or according to the public message type.

(SIB, RAR, Paging) determines the number of repetitions. Specifically, the SIB is determined according to the maximum coverage level, and the RAR is determined according to the Preamble sent by the UE, and the Paging is determined according to the RRC signaling or the UE coverage level. The manner in which the service channel repeatedly transmits the occupied resources includes the corresponding occupied resources when the occupied resource includes the low coverage level when the high coverage level is included. Preferably, the traffic channel carrying the public message has a control channel scheduling indication, and the control channel corresponding to the traffic channel carrying the sm message uses the M-SI-RNTI or the SI-RNTI to scramble the CRC, where the M-SI-RNTI For a predefined value; preferably, the M-SI-RNTI scrambled PDCCH and the scheduled PDSCH may be in the same subframe or different subframes. The public message transmission method provided by the preferred embodiment will be described below by taking the FDD and TDD systems as an example. FIG. 7 is a schematic flowchart 1 of a public message transmission method according to a preferred embodiment of the present invention. As shown in FIG. 7, the processing procedure on the base station side includes: Step S701: The base station sends a public message without using control channel scheduling. Indicates that the traffic channel carrying the system message is transmitted. The fixed starting subframe position is subframe 5 of the radio frame. The repeated subframe occupies subframes 0, 4, 5, and 9 in the radio frame. At this time, the base station determines the number of repetitions to be 20 times according to the maximum coverage level. The base station selects a frequency domain aggregation level of L=6 to transmit the public message. At this time, the repeated 20 subframes transmit the same public message, and these subframes select the first location of the candidate set in the search space of L=6 as the resource for transmitting the public message. The public message adopts a QPSK modulation mode, and the CRC information added by the public message is scrambled by the SI-RNTI or the RA-RNTI or the P-RNTI. Step S702: The base station repeatedly sends the service channel carrying the public message on the determined good resource. The traffic channel completes a transmission after reaching the number of repetitions in a non-contiguous predefined subframe. FIG. 8 is a schematic flowchart 2 of a public message transmission method according to a preferred embodiment of the present invention. As shown in FIG. 8, the processing procedure on the terminal side includes: Step S801: The terminal receives a public message, and needs to blindly receive a service channel carrying a public message. . The subframe 5 of the terminal in the radio frame serves as the start of one detection. The terminal determines that the public message is repeatedly transmitted 20 times according to the maximum coverage level in the cell, and therefore needs to perform 20 combined reception processes. The terminal performs detection and merging in subframes 0, 4, 5, and 9 in the radio frame. The frequency domain resource is blindly detected, and the corresponding candidate set is sequentially detected according to each aggregation level, and the same candidate set of the same aggregation level of each subframe is combined and demodulated, and the RNTI check is performed on the CRC of the public message according to the scrambling. By obtaining the public message to be received, otherwise the corresponding public message is not received after all the candidate sets of the aggregation level have been detected, it is considered that the corresponding public message is not received. Step S802, the terminal performs demodulation once in each subframe 5 of each radio frame, and demodulates the public message on the corresponding resource. With the preferred embodiment, the transmission resource of the service channel carrying the public message can be flexibly configured, and the terminal having the coverage enhancement requirement can receive the public message of the base station through repeated transmission of the service channel. The second embodiment still refers to FIG. 7. The processing procedure on the base station side includes: Step S70i: The base station sends the smi message, and does not use the control channel scheduling to indicate the traffic channel carrying the smi message for transmission. The fixed starting subframe position k satisfies the relationship (k + h*n) mod M=i. Where k is the number of the downlink subframes available for the start subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), 0^k^hl, where n indicates the radio frame where the start subframe k is located. h is the number of available downlink subframes included in one radio frame, M represents the period of intermittent retransmission and M is 1280 ms at this time, and i is preferably 9. The repeated subframe occupies subframes 0, 4, 5, and 9 in the radio frame. At this time, the base station determines the number of repetitions as 50 times according to the coverage level. The base station selects a frequency domain aggregation level of L=3 to transmit the smi message. At this time, the repeated 20 subframes transmit the same SIB1 message, and these subframes select the first position of the candidate set in the search space of L=3 as the resource for transmitting the SIB1 message. The smi message adopts a QPSK modulation mode, and the CRC information added by the smi message is scrambled by the M-SI-RNTI. Step S702: The base station repeatedly sends the service channel carrying the smi message on the determined good resource. The traffic channel completes a transmission after reaching the number of repetitions in a non-contiguous predefined subframe. Still referring to FIG. 8, the processing procedure on the terminal side includes: Step S80i: The terminal receives the smi message, and needs to blindly receive the service channel carrying the smi message. The terminal satisfies the relation (k + h*n) mod M=i at the fixed start subframe position k as the start of one detection. Where k is the number of the downlink subframes available for the starting subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), 0^k^hl, where n represents the radio frame where the starting subframe k is located. h is the number of available downlink subframes included in one radio frame, M represents the period of intermittent retransmission and M is 1280 ms at this time, and i is preferably 9. The terminal determines that the smi message is repeatedly transmitted 50 times according to the coverage level, so 50 combined reception processing is required. The terminal performs detection and merging in subframes 0, 4, 5, and 9 in the radio frame. The frequency domain resources are blindly detected, and the corresponding candidate sets are sequentially detected according to the respective aggregation levels, and the same candidate set of the same aggregation level of each subframe is combined and demodulated, and the RNTi check is performed on the CRC of the smi message according to the scrambling. By obtaining the smi message to be received, otherwise the corresponding smi message is not received after all the candidate sets of the aggregation level have been detected and the corresponding smi message has not been received. Step S802, the terminal performs demodulation once in a subframe that satisfies the starting subframe position in the period M, and demodulates the public message on the corresponding resource. With the preferred embodiment, the transmission resource of the service channel carrying the smi message can be flexibly configured, and the terminal with the coverage enhancement requirement can receive the smi message of the base station through repeated transmission of the service channel. The third embodiment still refers to FIG. 7. The processing procedure on the base station side includes: Step S70i: The base station sends an sm message, and does not use the control channel scheduling to indicate the traffic channel carrying the sm message for transmission. The fixed starting subframe position k satisfies the relationship (k + h*n) mod M=i. Where k is the number of the downlink subframes available for the start subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), 0^k^hl, where n indicates the radio frame where the start subframe k is located. h is the number of available downlink subframes included in one radio frame, M represents the period of intermittent retransmission and M is now 160 ms, and i is preferably 4. The repeating subframe occupies subframes 4, 9 in the radio frame. At this time, the base station determines the number of repetitions to be 10 times according to the coverage level. The base station transmits SIB messages in a predefined frequency domain location, and transmits on the six PRBs of the center 1.4 MHz bandwidth. At this time, the repeated 10 subframes transmit the same SIB message, and these subframes are all in the predefined center 1.4MHz bandwidth.

6 PRBs transmit the sm message. The sm message adopts QPSK modulation mode, and the sm message is added at this time.

The CRC information is scrambled by the SI-RNTI. Step S702: The base station repeatedly sends the service channel carrying the sm message on the determined good resource. The traffic channel completes a transmission after reaching the number of repetitions in a non-contiguous predefined subframe. Still referring to FIG. 8, the processing step on the terminal side includes: Step S80i: The terminal receives the sm message, and needs to directly detect the service channel that receives the bearer sm message. The terminal satisfies the relation (k + h*n) mod M at the fixed start subframe position k as the start of one detection. Where k is the number of the downlink subframes available for the start subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), 0^k^hl, where n indicates the radio frame where the start subframe k is located. h is the number of available downlink subframes included in one radio frame, M represents the period of intermittent retransmission and M is now 160 ms, and i is preferably 4. The terminal determines that the sm message is repeatedly transmitted 10 times according to the coverage level, and therefore needs to perform 10 combined reception processes. The terminal performs detection combining in subframes 4, 9 in the radio frame. At the same time, the terminal performs four intermittent cycles of attempted decoding. Receive demodulation in a predefined frequency domain resource, that is, 6 PRBs with a center 1.4 MHz bandwidth. According to the scrambling RNTi check on the CRC of the sm message, the sm message to be received is obtained, otherwise it is considered that the corresponding sm message is not received. Step S802: The terminal performs demodulation once in a subframe that satisfies the starting subframe position in 4 periods M, and demodulates the public message on the corresponding resource. With the preferred embodiment, the transmission resource of the service channel carrying the sm message can be flexibly configured, and the terminal with the coverage enhancement requirement can receive the sm message of the base station through repeated transmission of the service channel. The preferred embodiment 4 is still referring to FIG. 7. The processing procedure on the base station side includes: Step S70i: The base station sends an smi message, and simultaneously uses a control channel scheduling to indicate a traffic channel carrying the smi message for transmission. The starting subframe position is independently configured as subframe 5 of the even radio frame. The sm corresponds to the periodic repeating transmission mode, and the sending is performed according to the period M1 including the integer multiple of the sm message period, and the terminal merges and decodes in the period M1, wherein the period M1 is smaller than the update period of the SIB message, and Ml=320ms and less than the update of the SIB1 message. cycle. The base station side sends a control channel for scheduling the traffic channel before transmitting the service subframe carrying the smi message. At this time, the number of times of repeated transmission of the control channel is determined according to the maximum coverage level, and the subframes of the transmission control channels select the first position of the candidate set in the search space of L=8 as the resource for transmitting the control information. The CRC information added by the control channel scheduling the SIB 1 message at this time is scrambled by the M-SI-RNTI. Step S702: The base station sends a traffic channel carrying the smi message according to the resource scheduled by the control channel. The traffic channel performs a periodic repeat transmission within the period M1. Still referring to FIG. 8, the processing steps on the terminal side include: Step S80i: The terminal receives the smi message, and first needs to blindly check the control channel indicating the traffic channel carrying the smi message. The terminal blindly detects the repeatedly transmitted control channel, uses the same candidate set for the combined reception and demodulation at the same aggregation level, and performs CRC descrambling verification using the M-SI-RNTI to obtain corresponding control information when the determination is correct. Receiving, according to the content of the control information, the smi message in the corresponding frequency domain position, and receiving the smi message may perform the subframe 5 combined reception processing of the even radio frame in the M1 period, or attempt decoding of the non-merging demodulation in the period M1, that is, Attempts to decode 4 smi cycles. Step S802, the terminal performs demodulation once in the period M1, and demodulates the public message on the corresponding resource. In the preferred embodiment, the control channel is configured to indicate the traffic channel carrying the smi message, but the corresponding smi message is obtained by periodic merge decoding or multiple cycle attempts to ensure that the terminal with the coverage enhancement requirement receives the smi message of the base station. The fifth embodiment still refers to FIG. 7. The processing procedure on the base station side includes: Step S701: The base station sends a RAR message, and does not use the control channel scheduling to indicate the traffic channel carrying the RAR message for transmission. The starting subframe of the RAR is determined according to the subframe in which the Preamble sequence is located, and is fixed by k subframes separated from the ending subframe where the Preamble sequence is located, k=5. Repeated subframes are occupied in consecutive subframes. At this time, the base station determines the number of repetitions as 10 times according to the Preamble sent by the UE. The base station transmits RAR messages in a predefined frequency domain location and transmits them on two PRBs in the center 1.4 MHz bandwidth. The repeated 10 subframes at this time transmit the same RAR message, and these subframes transmit the RAR message in 2 PRBs of a predefined center 1 4 MHz bandwidth. The RAR message is in QPSK modulation mode, and the CRC information added by the RAR message is scrambled by the M-RA-RNTI. Step S702: The base station repeatedly sends the service channel carrying the RAR message on the determined good resource. The traffic channel completes the transmission after reaching the number of repetitions in consecutive subframes. Still referring to FIG. 8, the processing step on the terminal side includes: Step S801: The terminal receives the RAR message, and needs to directly detect the service channel that receives the RAR message. The terminal is separated from the end subframe in which the Preamble sequence is transmitted by itself by k subframes (k=5) as the start of one detection. The terminal determines that the RAR message is repeatedly transmitted 10 times according to the Preamble, and therefore needs to perform 10 combined reception processes. The terminal performs detection and combining in consecutive 10 subframes after the start subframe. Blind detection and combining are performed in the frequency domain, and each aggregation level is combined and received according to the same candidate set. According to the RNTI check on the CRC of the RAR message, the RAR message to be received is obtained, otherwise it is considered that the corresponding RAR message is not received. Step S802, the terminal performs demodulation once in consecutive 10 subframes from the start of the start subframe, and demodulates the RAR message on the corresponding resource. The present invention can flexibly configure the transmission resource of the traffic channel carrying the RAR message, and ensure that the terminal with the coverage enhancement requirement receives the RAR message of the base station through repeated transmission of the traffic channel. The preferred embodiment 6 is still referring to FIG. 7. The processing procedure on the base station side includes: Step S701: The base station sends a Paging message, and does not use the control channel scheduling to indicate the traffic channel carrying the Paging message for transmission. The fixed start subframe position H satisfies the relationship (H + h*n) mod T=j. Where H is the number of the downlink subframes available for the starting subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), O^H^h-1, where n indicates the location of the starting subframe H. The radio frame, h is the number of available downlink subframes included in one radio frame, T represents the period of repeated transmission and T is 640 ms at this time, and j is preferably 5. The repeated subframe occupies subframes 0, 4, 5, and 9 in the radio frame. At this time, the base station determines the number of repetitions to be 20 times according to the coverage level. The base station selects a frequency domain aggregation level of L=2 to transmit a Paging message. At this time, the repeated 20 subframes transmit the same Paging message, and these subframes select the second location of the candidate set in the search space of L=2 as the resource for transmitting the paging message. The Paging message adopts a QPSK modulation mode, and the CRC information added by the Paging message is scrambled by the MP-RNTI. Step S702, the base station repeatedly sends the service channel carrying the Paging message on the determined good resource. The traffic channel completes a transmission after reaching the number of repetitions in a non-contiguous predefined subframe. Still referring to FIG. 8, the processing steps on the terminal side include: Step S801: The terminal receives the Paging message, and needs to blindly receive the service channel carrying the Paging message. The terminal satisfies the relation (H + h*n) mod T=j at the fixed start subframe position H as the start of one detection. Where H is the number of the downlink subframes available for the starting subframe in the radio frame (the TDD is sequentially numbered according to the available downlink subframes in the radio frame), O^H^h-1, where n indicates the location of the starting subframe H. The radio frame, h is the number of available downlink subframes included in one radio frame, T represents the period of repeated transmission and T is 640 ms at this time, and j is preferably 5. The terminal determines that the paging message is repeatedly transmitted 20 times according to the coverage level, so 20 combined reception processing is required. The terminal performs detection and merging in subframes 0, 4, 5, and 9 in the radio frame. The frequency domain resource is blindly detected, and the corresponding candidate set is sequentially detected according to each aggregation level, and the same candidate set of the same aggregation level of each subframe is combined and demodulated, and the RNTI check is performed on the CRC of the Paging message according to the scrambling. By obtaining the Paging message to be received, otherwise the corresponding Paging message is not received after all the candidate sets of the aggregation level have been detected, the corresponding Paging message is not received. Step S802, the terminal performs demodulation once in a subframe that satisfies the starting subframe position in the period T, and demodulates the Paging message on the corresponding resource. The present invention can flexibly configure the transmission resource of the traffic channel carrying the Paging message, and ensure that the terminal with the coverage enhancement requirement receives the Paging message of the base station through repeated transmission of the traffic channel. It can be seen from the above embodiments that the public message transmission method provided by the foregoing embodiments, preferred embodiments, and preferred embodiments of the present invention solves technical problems such as reduced control overhead when a large number of public messages are repeatedly transmitted in the case of coverage enhancement in the LTE system. Therefore, the network side can ensure that the terminal with the coverage enhancement requirement can correctly receive the public message delivered by the base station and ensure the normal communication of the terminal. That is, the technical solution of the present invention can reduce the control information overhead in the LTE system, improve the transmission efficiency of the public message, improve the coverage performance of the deployment in the coverage enhancement environment of the terminal device, and ensure the normal communication of the terminal device. Industrial Applicability According to the embodiment of the present invention, the base station determines the location of the time-frequency resource for transmitting the public message according to the coverage level, and transmits the public message by using the time-frequency resource location, where the public message is carried on the service channel, and the method is solved. None of the related art causes a problem caused by a method of transmitting a public message in an overlay enhanced scenario, thereby providing a method for transmitting a public message in an overlay enhanced scenario. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A public message sending method, including:

The base station determines, according to the coverage level, a time-frequency resource location for transmitting the public message;

And transmitting the public message by using the time-frequency resource location, where the public message is carried on a service channel.

2. The method according to claim 1, wherein the traffic channel is repeatedly transmitted at the time-frequency resource location, wherein the number of repeated transmissions of the traffic channel is determined by at least one of the following: carrying the public The number of repeated transmissions of the traffic channel of the message is different from the number of repeated transmissions of the traffic channel scheduled by the control channel scrambled by the cell radio network temporary identifier C-RNTI;

The number of repeated transmissions of the traffic channel carrying the public message is the same;

Determining, according to the type of the public message that is carried, the number of repeated transmissions of the corresponding service channel;

The public message includes at least one of the following: a system information block sm message, a random access response RAR message, and a paging Paging message.

The method according to claim 2, wherein, according to the type of the public message that is carried, determining the number of repeated transmissions of the corresponding service channel includes at least one of the following:

Determining the repetition of the traffic channel carrying the sm message according to at least one of a number of repeated transmissions of the broadcast channel, a maximum coverage level of the base station, a periodic configuration of the sm message, or a first predefined value The number of transmissions;

Determining the bearer according to at least one of a preamble sent by the user equipment in the random access, a maximum coverage level of the base station, a coverage level of the user equipment, or a second predefined value.

The number of repeated transmissions of the traffic channel of the RAR message;

And according to at least one of a preamble sent by the user equipment in the random access, a maximum coverage level of the base station, a coverage level of the user equipment, a radio resource control layer RRC signaling, or a third predefined value. And determining a number of repeated transmissions of the traffic channel that carries the Paging message.

The method according to claim 3, wherein, according to the preamble sent by the user equipment in the random access, determining that the number of repeated transmissions of the traffic channel carrying the RAR message or the Paging message includes :

Determining the number of repeated transmissions of the traffic channel carrying the RAR message or the Paging message according to the time-frequency resource of the preamble or the sequence of the preamble.

The method according to claim 2, wherein the traffic channel carrying the sm message is intermittently repeatedly transmitted according to a preset period, wherein the preset period is a period of a fixed duration or according to a fourth predefined value. A set of periods of a set of durations.

The method according to claim 5, wherein the traffic channel carrying the sm message is repeatedly transmitted in the preset period, and the one-time repeated transmission is located in one or more sm periods.

The method according to claim 2, wherein the traffic channel carrying the sm message is repeatedly transmitted in a non-periodic manner.

The method according to claim 1, wherein the traffic channel carrying the public message, in the case of no control channel scheduling indication, determines, by way of at least one of the following, for repeatedly transmitting the traffic channel. Frequency domain resources:

Determining, in a frequency domain aggregation level, a number of PRBs in a physical resource block PRB resource occupied by the frequency domain resource, where a binary phase shift keying BPSK modulation or a quadrature phase shift keying QPSK is used on the frequency domain resource. Modulating, and scrambling the cyclic redundancy check CRC bits corresponding to the public message by using the first radio network temporary identifier RNTI, the second RNTI, and the third RNTI, respectively, where the first RNTI includes different SI values The RNTI and the M-SI-RNTI are used for scrambling the CRC bits corresponding to the SIB message; the second RNTI includes a P-RNTI and an MP-RNTI with different values, and is used for the CRC bit corresponding to the Paging message. The third RNTI includes RA-RNTI and M-RA-RNTI with different values, and is used for scrambling of CRC bits corresponding to the RAR message;

And determining, according to the indication of the RRC signaling, the PRB resource occupied by the frequency domain resource; determining, according to the fifth predefined value, the PRB resource occupied by the frequency domain resource.

9. The method according to claim 8, wherein the starting position of the PRB resource is determined by one of the following:

Determining that the PRB resource with the lowest number among the PRB resources is the starting location; Determining, by the formula ^^^ + ¹¹¹ ^^^^^^^′, the starting position of the PRB resource with the highest numbered PRB resource in the PRB resource; wherein, L represents an aggregation Level; = ( "iW7T ) m.d or = (H SW . ^^Jmod ; 1, ² ,···, M^ . M ( ^U represents the number of candidate sets corresponding to the aggregation level L; ^ indicates that the subframe number is The total number of PRBs occupied by the traffic channel carrying the public message when there is no control transmission on the subframe of k; D represents the constant 65537; A represents the constant 39827; k represents the subframe number; i=0, ..., L-1 represents A search unit corresponding to the aggregation level; ^ indicates the value of the RNTI that scrambles the CRC bits, SFN indicates the radio frame number, and mod indicates the modulo operation.

10. The method according to claim 8, wherein, in the case that the RPB resource occupied by the frequency domain resource is determined according to an indication of RRC signaling or according to a fifth predefined value, the PRB resource is continuous Or a discrete PRB resource, and the number of PRBs of the RPB resource is less than or equal to 6.

11. The method according to claim 8, wherein: determining, at a starting position of the traffic channel carrying the public message in a subframe in which the traffic channel is transmitted, is a third orthogonal frequency division multiplexing OFDM symbol. Or, determining, according to the bandwidth of the system, a start symbol of the traffic channel carrying the public message in the subframe.

12. The method according to claim 11, wherein, according to a bandwidth of the system, determining, according to a bandwidth of the system, the manner in which the start symbol of the traffic channel carrying the public message in the subframe includes one of the following:

And determining, in the case that the system bandwidth is 1.4 MHz, that the fifth OFDM symbol of the subframe is the start symbol;

In case the system bandwidth is greater than 1.4 MHz, the fourth OFDM symbol of the subframe is determined to be the start symbol.

The method according to any one of claims 2 to 7, wherein the time-frequency resource location occupied by the traffic channel carrying the sm message in the case of a larger coverage level comprises a smaller coverage level. The location of the time-frequency resource occupied in the case.

The method according to any one of claims 2 to 7, wherein the starting position of the subframe for transmitting the traffic channel is determined by one of the following ways:

Determining, according to the type of the public message that is carried, a starting position of the subframe by using a sixth predefined value; Determining, according to the κ value, a starting position of the subframe for transmitting the traffic channel carrying the sm message, where the K value satisfies a relationship (K + h*n) mod M=i, where K Indicates the number of available downlink subframes in the radio frame in the starting position, 0 K hl, n indicates the radio frame in the subframe where the starting position is located, and h is the available downlink subframe included in one radio frame. The number of times, M denotes the period of intermittent repeated transmission, 0 i hl, wherein, in the time division duplex TDD system, the downlink subframes in the radio frame are re-sequenced sequentially; the RAR message is determined to be transmitted according to the L value or a starting position of the subframe of the traffic channel of the paging message, where the L value satisfies a relation (L + h*n) mod N=j; where L represents a subframe at a starting position The number of available downlink subframes in the radio frame, 0 L h-1 , n indicates the radio frame in which the subframe at the starting position is located, h is the number of available downlink subframes included in one radio frame, and N indicates repeated transmission. The number of times, 0 j hl, where, in the TDD system, according to none The downlink subframes may be renumbered sequentially in the line frame;

Determining, according to the H value, a starting position of the subframe for transmitting the traffic channel carrying the Paging message, where the H value satisfies a relationship (H + h*n) mod T=j _; wherein H Indicates the number of available downlink subframes in the radio frame in the starting position, 0 H hl, n indicates the radio frame in the subframe where the starting position is located, and h is the available downlink subframe included in one radio frame. The number, T represents the period of repeated transmission, 0 j hl, where, in the TDD system, the downlink subframes in the radio frame are re-ordered sequentially;

Determining for the transmission bearer according to one of a subframe in which the sequence of the preamble in the random access is located, a type of the sequence, a coverage level of the base station corresponding to the preamble, or a seventh predefined value The starting position of the subframe of the traffic channel of the RAR message.

The method according to any one of claims 2 to 7, wherein determining the location of the subframe comprises at least one of the following according to a type of the public message that is carried:

Determining that a subframe for transmitting the traffic channel carrying the RAR message is sent in a continuous manner;

Determining that a subframe for transmitting the traffic channel carrying the Paging message is sent in a discrete selection manner;

Determining that a subframe for transmitting the traffic channel carrying the sm message is transmitted in a cyclically repeated manner.

16. The method according to claim 15, wherein, in a case where it is determined that a subframe for transmitting the traffic channel carrying the sm message is transmitted in a cyclically repeated manner, scheduling a control channel of the traffic channel is adopted The same cycle is sent in a repeating manner.

The method according to any one of claims 1 to 7, wherein, in the case that the traffic channel carrying the public message is periodically transmitted repeatedly, a plurality of subframes for repeatedly transmitting the traffic channel are used. The frequency domain resources of the traffic channel carrying the public message are the same.

The method according to any one of claims 1 to 7, wherein, in the case that the traffic channel carrying the public message has a control channel scheduling indication, in a method for repeatedly transmitting the traffic channel On a plurality of subframes, the control channel corresponding to the traffic channel carrying the public message occupies the same resource size.

The method according to claim 18, wherein the number of repeated transmissions of the control channel is determined according to a maximum coverage level of the base station or a type of the public message carried by the corresponding traffic channel.

The method according to any one of claims 2 to 7, wherein, when the traffic channel carrying the public message has a control channel scheduling indication, the traffic channel carrying the sm message corresponds to The control channel uses the M-SI-RNTI or the SI-RNTI to scramble the CRC bits, wherein the value of the M-SI-RNTI is different from the value of the SI-RNTI.

The method according to claim 20, wherein the physical downlink control channel scrambled by using the M-SI-RNTI and the physical downlink traffic channel scheduled by the physical downlink control channel are in the same subframe or different subframes transmission.

22. A public message receiving method, comprising:

The user equipment receives the public message at a specific time-frequency resource location according to the coverage level, where the specific time-frequency resource location is determined by the network side, and the public message is carried on the traffic channel.

23. The method according to claim 22, wherein the traffic channel is repeatedly received at the specific time-frequency resource location, wherein the number of repetitions of the traffic channel is determined by at least one of the following: The number of repetitions of the traffic channel of the public message is different from the number of repetitions of the traffic channel scheduled by the control channel scrambled by the cell radio network temporary identifier C-RNTI;

The number of repetitions of the traffic channel carrying the public message is the same;

Determining the number of repetitions of the corresponding traffic channel according to the type of the public message that is carried. The public message includes at least one of the following: a system information block sm message, a random access response RAR message, and a paging Paging message.

24. The method according to claim 23, wherein determining the number of repetitions of the corresponding traffic channel according to the type of the public message to be carried comprises at least one of the following:

Determining the number of repetitions of the traffic channel carrying the sm message according to at least one of a repetition number of the broadcast channel, a maximum coverage level, a periodic configuration of the sm message, or a first predefined value;

Determining, according to at least one of a preamble sent by the user equipment in the random access, a maximum coverage level of the base station, a coverage level of the user equipment, or a second predefined value, determining to carry the RAR message The number of repetitions of the traffic channel;

And according to at least one of a preamble sent by the user equipment in the random access, a maximum coverage level of the base station, a coverage level of the user equipment, a radio resource control layer RRC signaling, or a third predefined value. And determining, by the number of repetitions of the traffic channel that carries the paging message.

The method according to claim 24, wherein determining, according to the preamble sent by the user equipment in the random access, the number of repetitions of the traffic channel carrying the RAR message or the Paging message comprises:

Determining, according to the time-frequency resource of the preamble or the sequence of the preamble, the number of repetitions of the traffic channel carrying the RAR message or the Paging message.

The method according to claim 25, wherein the traffic channel carrying the SIB message is intermittently repeatedly received according to a preset period, wherein the preset period is a period of a fixed duration or according to a fourth predefined value. A set of periods of a set of durations.

27. The method according to claim 26, wherein the traffic channel carrying the SIB message performs a repeated reception in the preset period, and the one-time repeated reception is located in one or more sm periods.

The method according to claim 23, wherein, when the traffic channel carrying the SIB message is aperiodicly repeated, receiving the public message at the specific time-frequency resource location comprises: Blind detection determines the traffic channel carrying the sm message.

The method according to claim 23, wherein the method further comprises: the user equipment performing a plurality of sm period attempt decoding on the traffic channel carrying the sm message.

30. The method according to claim 23, wherein the traffic channel carrying the public message, in the case of no control channel scheduling indication, determines, by way of at least one of the following, for repeatedly receiving the traffic channel. Frequency domain resources:

In the frequency domain aggregation level, blindly detecting the number of PRBs in the physical resource block PRB resource occupied by the frequency domain resource, where a binary phase shift keying BPSK demodulation or a quadrature phase shift key is used on the frequency domain resource. The QPSK is demodulated, and the cyclic redundancy check CRC bits corresponding to the public message are descrambled by the first radio network temporary identifier RNTI, the second RNTI, and the third RNTI, respectively, where the first RNTI includes different values. The SI-RNTI and the M-SI-RNTI are used for descrambling the CRC bits corresponding to the SIB message; the second RNTI includes a P-RNTI and an MP-RNTI with different values, and is used for the Paging message. The CRC bit is descrambled; the third RNTI includes RA-RNTI and M-RA-RNTI with different values, and is used for descrambling CRC bits corresponding to the RAR message;

The method according to claim 30, wherein the starting position of the PRB resource is determined by one of the following:

Determining that the PRB resource with the lowest number among the PRB resources is the starting location; determining that the PRB resource with the largest number among the PRB resources is the starting location; according to the formula ^^^ + ^^^^^^^' Determining the starting position of the PRB resource, wherein the L aggregation level = · n _mTI ) modD or = (H. "Draw, modD; _m = ₂ , .." ⁽ⁱ⁾ .

M ^(L) represents the number of candidate sets corresponding to the aggregation level L; ^ represents the total number of PRBs occupied by the traffic channel carrying the public message for the uncontrolled transmission on the subframe with the subframe number k; D represents the constant 65537; A represents a constant 39827; k represents the subframe number; i=0, ..., L-1 represents a search unit corresponding to an aggregation level; ^! ^ indicates the value of the RNTI that scrambles the CRC bits, SFN indicates the radio frame number, and mod indicates the modulo operation.

The method according to claim 30, wherein, in the case that the RPB resource occupied by the frequency domain resource is determined according to an indication of RRC signaling or according to a fifth predefined value, the PRB resource is continuous Or a discrete PRB resource, and the number of PRBs of the RPB resource is less than or equal to 6.

33. The method of claim 30, wherein determining a starting location of the traffic channel carrying the public message within a subframe in which the traffic channel is transmitted is a third orthogonal frequency division multiplexing OFDM symbol , or And determining, according to a bandwidth of the system, a start symbol of the traffic channel carrying the public message in the subframe.

34. The method according to claim 33, wherein, according to a bandwidth of the system, determining, according to a bandwidth of the system, the manner in which the start symbol of the traffic channel carrying the public message in the subframe includes one of the following:

The method according to any one of claims 23 to 29, wherein a specific time-frequency resource location occupied by the traffic channel carrying the SIB message with a larger coverage level includes a smaller coverage The specific time-frequency resource location occupied by the level.

The method according to any one of claims 23 to 29, wherein a starting position of the subframe for receiving the traffic channel is determined by one of the following ways:

Determining, according to the type of the public message that is carried, a starting position of the subframe by using a sixth predefined value;

Determining, according to the κ value, a starting position of the subframe for transmitting the traffic channel carrying the sm message, where the K value satisfies a relationship (K + h*n) mod M=i, where K Indicates the number of available downlink subframes in the radio frame in the starting position, 0 K hl, n indicates the radio frame in the subframe where the starting position is located, and h is the available downlink subframe included in one radio frame. The number of times, M denotes the period of intermittent repeated transmission, 0 i hl, wherein, in the time division duplex TDD system, the downlink subframes in the radio frame are re-sequenced sequentially; the RAR message is determined to be transmitted according to the L value or a starting position of the subframe of the traffic channel of the paging message, where the L value satisfies a relation (L + h*n) mod N=j; where L represents a subframe at a starting position The number of available downlink subframes in the radio frame, 0 L h-1 , n indicates the radio frame in which the subframe at the starting position is located, h is the number of available downlink subframes included in one radio frame, and N indicates repeated transmission. The number of times, 0 j hl, where, in T In the DD system, the downlink subframes in the radio frame are renumbered sequentially;

Determining, according to the H value, a starting position of the subframe for transmitting the traffic channel carrying the Paging message, where the H value satisfies a relationship (H + h*n) mod T=j _; wherein H Indicates the number of available downlink subframes in the radio frame in the starting position, 0 H hl, n indicates the radio frame in the subframe where the starting position is located, and h is the available downlink subframe included in one radio frame. Quantity, T Representing the period of repeated transmission, 0 j hl, where, in the TDD system, the downlink subframes in the radio frame are re-ordered sequentially;

Determining for receiving a bearer according to one of a subframe in which the sequence of the preamble in the random access is located, a type of the sequence, a coverage level of the base station corresponding to the preamble, or a seventh predefined value The starting position of the subframe of the traffic channel of the RAR message.

37. The method according to claims 23 to 29, wherein determining the location of the subframe comprises at least one of the following according to a type of the public message carried:

Determining that a subframe for transmitting the traffic channel carrying the RAR message is received in a continuous manner;

Determining that a subframe for transmitting the traffic channel carrying the Paging message is received in a discrete selection manner;

A subframe for determining to transmit the traffic channel carrying the sm message is received in a cyclically repeated manner.

38. The method according to claim 37, wherein, in a case where it is determined that a subframe for transmitting the traffic channel carrying the SIB message is received in a cyclically repeated manner, scheduling a control channel of the traffic channel is adopted The same cycle is received in a repeating manner.

The method according to any one of claims 22 to 29, wherein, in the case that the traffic channel carrying the public message adopts periodic repeated reception, a plurality of subframes for repeatedly receiving the traffic channel are used. The frequency domain resources of the traffic channel carrying the public message are the same.

The method according to any one of claims 22 to 29, wherein, in the case that the traffic channel carrying the public message has a control channel scheduling indication, in a method for repeatedly receiving the traffic channel On a plurality of subframes, the control channel corresponding to the traffic channel carrying the public message occupies the same resource size.

The method according to claim 40, wherein the number of repeated receptions of the control channel is determined according to a maximum coverage level or a type of the public message carried by the corresponding service channel.

The method according to any one of claims 23 to 29, wherein, when the traffic channel carrying the public message has a control channel scheduling indication, the traffic channel carrying the sm message corresponds to The control channel uses the M-SI-RNTI or the SI-RNTI to scramble the CRC bits, where the value of the M-SI-RNTI is different from the value of the SI-RNTI.

43. The method according to claim 42, wherein the physical downlink control channel scrambled by using the M-SI-RNTI and the physical downlink traffic channel scheduled by the physical downlink control channel are in the same subframe or different subframes receive.

44. A public message sending device, located on a network side, the device includes:

a first determining module, configured to determine, according to the coverage level, a time-frequency resource location for transmitting a public message; and a sending module, configured to send the public message by using the time-frequency resource location, where the public message is carried on a service channel .

45. A public message receiving device, located on a terminal side, where the device includes:

The receiving module is configured to receive a public message at a specific time-frequency resource location according to the coverage level, where the specific time-frequency resource location is determined by the network side, and the public message is carried on the service channel.

A public message transmission system comprising the public message transmitting apparatus of claim 44 and the public message receiving apparatus of claim 45.